TIBOTake your exam before you take it
Upload your review sheet. Get an exam like your professor's, graded with the why.
Sound familiar?
Is the first time you test yourself the real exam?
Do you reread your notes and still blank on the first question?
Does AI explain your class using syntax your professor never taught?
Do you memorize theory but freeze when the exam wants real code?
Exam Friday. You read the slides twice and still have no idea what the exam will ask.
Rereading feels like studying — but it isn't practice.
More AI chat isn't the fix — it just hallucinates code your professor never taught.
Today
Thursday night, rereading slides, still not sure what the exam will ask.
In 6 months, if nothing changes
Same chaos — and your first real practice is the exam itself.
THE MECHANISM
Practice exactly what your professor tests
Generic AI guesses. Source Lock never does — every exam question comes only from what your professor actually gave you.
Upload your review sheet
Plus slides, PDFs, or a photo of your notes.
Source Lock designs your exam
Sections, question types and difficulty like your professor's.
Take it and see the why
Every answer is graded, explained and cites its page.
Before
ChatGPT explains it with syntax your professor never used.
After
Every question and answer sourced to the exact slide your professor showed.
0%
of exam questions cite a real page — the Source Lock guarantee.
INSIDE THE APP
Take the exam. See the why.
Answer one question at a time, like the real exam
Your score, and exactly what to fix
Every way to study one topic, in one place
See exactly what's next in your syllabus
PRICING
Try it free. Then under $0.34 a day
$0.00/mo
Less than $0.34 a day
- Practice exams shaped like your real one
- Graded with the why — disagree for a second look
- Every question cites your own material
- Retake what you missed, plus a plan to exam day
- Up to 6 full exams a month, from any class
Source‑Locked Guarantee · 7-day refund
Source‑Locked Guarantee
Every exam question traces back to a page in your material — or you get a full refund within 7 days, no questions asked.
FAQ
What you might be wondering
No — that's exactly what Source Lock prevents. Every exam question traces back to a page in your review sheet, slides, or notes. If your professor didn't teach it, TIBO doesn't test you on it.
You try a sample practice exam for free, no credit card needed. Your 5-day trial cancels in one tap — and if you upgrade and it's not for you, the 7-day money-back guarantee still has you covered.
Big PDFs (up to 15MB each) upload fine — in our tests a 6MB deck was done in about 30 seconds, with a clear "building" screen: never a frozen page. If anything fails, that try doesn't count against your monthly limit.
TIBO designs the sections, question types and difficulty from your review sheet and past exams — including code questions for CS classes. You can edit the design before it generates, and tell it when a grade looks wrong.
ChatGPT answers from the whole internet. TIBO only answers from your own class material — same professor, same syllabus, same exam.
Walk into your exam having taken it once
You open TIBO, take a practice exam, see exactly what you missed and why, and walk into the real one knowing where you stand.
Free sample exam · no credit card
PS: Try a sample exam free today — no card, and you'll see how it works in under a minute.