/sci/ - Science & Math

What is a good site to practice college math online? I really need to practice for a calculus 1 exam and it would be really handy if I could test my performance doing tons of exercises of limits, derivatives, integrals, differential equations and such.
It's just tiresome to look for "solved x exercises" on youtube to check out if I'm doing things right, there MUST be a place where there are exercises of everything I should know about calculus and explanations on how to solve them to see where I'm commiting errors if I do them wrong.

>>9885462
Is that animation created by moving away from the object and then coming in to make our the same size?