FDF Labs
To learn
Test with tutor
- 6 questions per test, easier than the exam
- No clock
- Steps open one at a time, when you ask for them
- It never shows you the answer at once
Practise before the exam.
Examinz uses artificial intelligence to build practice tests and exams on any topic, and corrects you step by step. You paste a text, upload a PDF, pick a unit from its knowledge base or search the web, then choose the difficulty from 0 to 9. At FDF Labs we build its technology and platform.
Exercise 1Differentiate f(x) = x² · sin(x).
f′(x) = 2x · cos(x)Incorrect
Close. Before you go on: which rule do you use to differentiate a product of two functions?
It's a product, so use the product rule: (u·v)′ = u′·v + u·v′.
f′(x) = 2x · sin(x) + x² · cos(x)Right
One to learn. One to prove it.
First, short tests with a tutor that guides you step by step. Then the exam: every question, a clock and no help.
To prove it
Exam
- 15 questions, at the difficulty you chose
- Handed in automatically when time runs out
- No help, not even from the tutor in another tab
- Review with the tutor after you hand it in
From 0 to 9.
You choose the level to test yourself at. Examinz's own sample questions, from the lowest level to the highest:
- 0
You have 3 boxes with 4 pencils each. How many pencils do you have in total?
Children or adults with little schooling - 2
Solve: 2x + 5 = 17.
Primary and lower secondary school - 4
Find the tangent line to f(x) = x² − 3x at the point x = 1.
Advanced high school and university entrance - 6
From a square sheet 12 cm on a side you make an open box: you cut a square of side x from each corner and fold up the edges. Which x gives the largest volume?
University (midterms and finals) - 9
Find every continuous function f: ℝ → ℝ such that f(x + y) = f(x) + f(y).
Maximum: olympiad- or research-style questions
The questions in its knowledge base come from real problems in licensed books and exams, with their source.
For companies too.
For small businesses and companies that train and certify salespeople, technicians and new staff.
- You load what they need to know
- Manuals, lists and procedures.
- Each one practises with the tutor
- Step-by-step guided tests, with a deadline.
- A final exam measures it
- You see each employee's score and certificate.
Try the demo.
examinz.com has the demo, the plans and sign-up. Starting is free: 3 tests and 1 exam.