Hi
What are the best ways to prep for the test?
Is there something like khan academy for act ?
Where are the act practice questions and how many are them?
Take practice tests. I used the Barron’s book, so you might find that one useful.
There is a free ACT full length practice test on their website. You can also use practice books— I used the official red one. When you take your practice test, time yourself and use the same time limits as the official test. This will give you an idea of how you will score. Afterwards, go over your answers and study what you got wrong.