Is it possible to become good at math by learning by myself ?

This.
You have to summon aliums.

You have to go to a library and find out by yourself.

>What are the best books for self-learning ?
This covers the very basics.

...

>tfw ran out of time on ACT and got 29 in math
>tfw 3% chance of admission to MIT even with perfect GPA
Better'd just kill myself now.

Technically, but not in practice.

you can always retake it, user. You only have to submit your highest score and can choose to not send previous scores if you so wish.

You can understand the concepts but problems are going to fuck you up.

source: tried learning calculus by myself

This

I am, just gotta study more and not be an indecisive piece of shit about some questions. The fact that you can use a ti-nspire is practically cheating in and of itself.