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Verified brand hub
The official home of ThunderStudy, ThunderTest and ThunderAI
ThunderStudy.online lists every official website of ThunderStudy, ThunderTest, ThunderAI and Wondermayank. Free exam-prep tools for CUET, JEE, NEET, SSC, Banking, CAT and CLAT students, in one trusted place.
4official brands
16verified websites
2languages
7exam families
Our brands
Four brands, one official family
Each brand has its own job. Here is what every one of them does, who it is for and where to find it.
Brand 1 of 4
ThunderStudy
The main exam-prep hub. Notes, practice and study tools for Indian competitive exam students, free to use and made by one independent developer.
CUETJEENEETSSCBankingCATCLAT
Best forCompetitive exam students
LanguagesHindi and English
PriceFree for students
Websitethunderstudy.indevs.in
7Exam families
FreeFor students
2Languages
2018Building tools since
Question 8 of 2030:00
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AnsweredSkippedMarked
Brand 2 of 4
ThunderTest
CBT mock tests and previous-year papers in a real exam-style screen, so exam day feels familiar.
ScreenTimer and question palette
PracticeMock tests and PYQs
ResultScorecard after the test
Websitethundertest.indevs.in
Brand 3 of 4
ThunderAI
AI study tools powered by the Tiny model. Pick a tool, give it a topic, and get a mock test, mind map, flashcards or formula sheet.
Hi! Pick a tool and a topic, and I will build it.
Mind map, Photosynthesis, Quick
Done. Your map has 2 levels. Want Deep mode next?
AI Mock Test MakerAI MindmapAI FlashcardAI Formula SheetAI Chatbot Study
Websiteai.thunderstudy.indevs.in
ModesQuick and Deep
Brand 4 of 4
WM
WonderMayank
Web Developer and CreatorThe creator hub. Free utility tools, vibecoding guides and experiments by Mayank, an independent developer building free web tools since 2018.
RoleIndependent developer
CountryIndia
BrandsWondermayank, ThunderStudy
Contactwondermayank.in/contact
Telegramt.me/wondermayank
Inside ThunderStudy
Every tool and subdomain
Six more official ThunderStudy websites, each with its own job and its own look.
Which word fits the blank?
ABCD
Thunder English
Daily English practice for exam students: reading comprehension, grammar and vocabulary quizzes in short sessions.
thunderenglish.indevs.in1 Input2 Depth3 Generate
AI Mock Test
Make a CBT mock test with AI from your own PDF or topic, in a real exam-style screen.
aimock.thunderstudy.indevs.inMind Map
Turn any topic into a clear mind map. Quick mode builds 2 levels, Deep mode builds 3.
mindmap.thunderstudy.indevs.inF = m × a
Force is mass times acceleration
Formula Story
Formulas told as short stories, so they stick in memory and are easier to revise before the exam.
formula.thunderstudy.indevs.inExam news›Study guides›Updates›
ThunderStudy Blog
Exam news, study guides and updates from the ThunderStudy team, written in plain language.
blog.thunderstudy.indevs.inFree resources
Free tests, notes and formula sheets
Everything below is free for students. Pick your class or exam and start practising today.
Free formula sheet
Applied Maths formula sheet
A free Applied Mathematics formula sheet for Class 12 commerce students. Every important formula is grouped unit by unit, so revision before boards, CUET and school tests takes minutes, not hours.
NumbersAlgebraCalculusProbabilityStatisticsIndex numbersFinancial mathsLinear programming
ForClass 12 commerce, CBSE
Use it forBoards, CUET, school tests
PriceFree
Compound interestA = P(1 + r/100)n
Simple interestSI = P × r × t / 100
ProbabilityP(E) = favourable / total
AccountancyBusiness StudiesEconomicsApplied MathsEnglish
Class 12 Commerce study material
Free notes, practice and revision help for Accountancy, Business Studies, Economics, Applied Maths and English, built for Class 12 commerce students.
CUET mock testCUET PYQCommerceGeneral test
Free CUET mock tests and PYQs
Practise CUET with free CBT mock tests, previous year question papers and a result scorecard, including commerce domain subjects and the general test.
JEE MainNEETBiology CBTPYQ
Free JEE and NEET mock tests
Free JEE Main and NEET practice with exam-style CBT screens, previous year questions and Biology CBT pages. No fees, no sign-up wall.
SSCBankingCATCLATNDA
SSC, Banking, CAT and CLAT
Free mock tests and daily English practice for SSC, Banking, CAT and CLAT aspirants, with timer, palette and instant review.
AI mock testMind mapFlashcardsFormula sheet
Free AI study tools
Make a free AI mock test, mind map, flashcards or formula sheet from any topic or PDF in Quick or Deep mode.
PDF readerEnglish quizGrammarVocabulary
Free PDF reader and English practice
Read notes and papers with a free online PDF reader, then sharpen reading, grammar and vocabulary with daily English practice.
Popular searches
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Free practice helps you prepare, but no platform can promise marks or a rank. Your result depends on your own effort.
Official websites
Every verified website
If a website is not on this list, it is not ThunderStudy. Scroll sideways on small screens.
| Name | Website | What it is |
|---|---|---|
| ThunderStudy | thunderstudy.indevs.in | Main exam-prep hub |
| ThunderTest | thundertest.indevs.in | CBT mock tests and PYQs |
| ThunderStudy AI | ai.thunderstudy.indevs.in | AI study tools |
| AI Mock Test | aimock.thunderstudy.indevs.in | AI CBT mock test maker |
| Mind Map | mindmap.thunderstudy.indevs.in | AI mind maps |
| Formula Story | formula.thunderstudy.indevs.in | Formula story mode |
| ThunderStudy PDF | thunderstudypdf.indevs.in | PDF reader |
| Thunder English | thunderenglish.indevs.in | Daily English practice |
| ThunderStudy Blog | blog.thunderstudy.indevs.in | Guides and updates |
| Wondermayank | wondermayank.in | Creator hub |
| Projects | project.wondermayank.in | Free utility tools |
| Vibecoding | make.wondermayank.in | Website and Telegram guides |
| Wondermayank Blog | blog.wondermayank.indevs.in | Creator blog |
| ThunderStudy Official | thunderstudy.online | This brand hub |
| ThunderStudy Info | thunderstudy.info | Brand knowledge hub |
| Telegram | t.me/thunderstudy | Official Telegram channel |
Stay safe
How to spot the real ThunderStudy
Copycat websites use similar names. Check before you trust one.
Not affiliated
thunderstudy.site is not connected to ThunderStudy, ThunderTest, ThunderAI or Wondermayank. ThunderStudy never hosts leaked or pirated paid-course lectures.
Quick checks
Official sites end in indevs.in, wondermayank.in, thunderstudy.online or thunderstudy.info. They carry the line "by wondermayank" in the header and link back to this list.
Contact and info
Talk to the real team
Questions, file requests or a copycat site to report? Reach us only through these official channels.
Contact
Fastest reply is by email or the contact page.
About us
ThunderStudy, ThunderTest and ThunderAI are made by Mayank, an independent developer in India who has built free web tools since 2018.
Every tool is free for students. We never sell leaked or pirated courses.
Read moreFAQ
Questions, answered
Short, plain answers that people and search engines can both read.
What is ThunderStudy?
ThunderStudy is a free exam-prep platform for Indian competitive exam students, built by Wondermayank. It offers CBT mock tests, previous-year papers, AI study tools and a PDF reader for CUET, JEE, NEET, SSC, Banking, CAT and CLAT.
Is ThunderStudy free?
Yes, ThunderStudy tools are free for students. You can practise mock tests, use the AI study tools and read PDFs without paying.
What is ThunderTest?
ThunderTest is the CBT mock test platform of the ThunderStudy family, at thundertest.indevs.in. It has exam-style practice for CUET, JEE, NEET, SSC, Banking, CAT and more.
What is ThunderAI?
ThunderAI is the AI side of ThunderStudy, at ai.thunderstudy.indevs.in. It includes an AI mock test maker, mind maps, flashcards and formula sheets.
Who made ThunderStudy and ThunderTest?
ThunderStudy, ThunderTest and ThunderAI are made by Mayank, an independent developer from India who publishes free web tools under the name Wondermayank.
Which websites are official?
The official ThunderStudy websites are thunderstudy.indevs.in, thundertest.indevs.in, ai.thunderstudy.indevs.in, thunderstudypdf.indevs.in, thunderenglish.indevs.in and wondermayank.in, plus thunderstudy.online and thunderstudy.info as official brand hubs.
Is thunderstudy.site connected to ThunderStudy?
No, thunderstudy.site is not connected to ThunderStudy or Wondermayank. ThunderStudy does not host leaked or pirated paid-course lectures, so please use only the websites listed on this page.
Where can I get a free Applied Maths formula sheet for Class 12?
ThunderStudy offers a free Applied Mathematics formula sheet for Class 12 commerce students, covering the main units such as algebra, calculus, probability, statistics, index numbers, financial mathematics and linear programming.
Is there free Class 12 commerce study material?
Yes, ThunderStudy gives free Class 12 commerce study material, including notes, practice tests and formula sheets for subjects like Accountancy, Business Studies, Economics, Applied Maths and English.
Can I take a free CUET mock test online?
Yes, ThunderTest offers free CUET mock tests in an exam-style CBT screen with a timer, question palette and result scorecard, plus previous-year papers.
Are there free JEE and NEET mock tests?
Yes, ThunderTest has free JEE and NEET mock tests and previous-year question practice, including Biology CBT pages, with no payment needed.
Do you have SSC, Banking, CAT and CLAT practice tests?
Yes, ThunderTest has free practice tests for SSC, Banking, CAT and CLAT, along with daily English practice at Thunder English.
Is study material available in Hindi?
Yes, ThunderStudy supports Hindi and English, so students can practise and revise in the language they are comfortable with.
Can ThunderStudy guarantee marks or a rank?
No, no study platform can honestly promise marks or a rank. ThunderStudy gives free practice, notes and tools so you can prepare better, and your result depends on your own effort.
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