This might seem dumb,but: How do i improve in math?

آپ don't. Trust me I know. I've been trying since middle school and I still can't get over a D on tests.

We're allowed to use calculators at my school :c and I am in normal math. If I wasn't allowed to use a calculator I would probably be screwed. I really wish I could help آپ but I honestly don't know what to say. Practice maybe?

Constantly ask ur teacher 4 help even if they don't want 2 give it! That is wat I have done 4 the last few years now!

آپ and the other students could sign a petition and/or complain to administrators I guess. If the whole class didn't finish, یا the majority, that's not fair, especially if آپ were an A B student, because apparently آپ know it.

I think آپ need to complain about your teacher to someone at your school. She sounds extremely unfair and probably needs a talking-to.
The way to improve maths is to revise.

Alternate Testing! If آپ can't finish a test in time tell your guidance counselor and they might put آپ in the Alternate Testing room when آپ write tests and stuff and they will give آپ extra time especially if not being able to finish cause آپ a lot of stress. That is what most schools around here are like anyway.

If the class can't finish the entire test, then she is being completely unfair. Math tests should ONLY be دیا a number of problems that the average time it takes for the class to finish plus a few مزید minutes, that way there's no excuse for not finishing the test in time. She needs to get rid of some of the problems on the test to fit the necessary time یا allow calculators. It seems like she's a horrible teacher. Its hard to improve times in math unless you're a g-ness یا something, but even then math follows rules and steps that آپ can't always skip. The only way آپ can improve in math is like other classes, study and do problems over and over again until آپ got the pattern down.

آپ کہا yourself, "The only reason I failed is because we weren't دیا enough time". So it might not be that آپ need to improve, but to have مزید time on the tests. 45 منٹ sounds very short on time for a test so if your teacher won't do anything tell the principle/headteacher (or whatever آپ call it where آپ are).
I had an exam a week پہلے and it was 2 hours even though we all usually finish within the first hour. The point is 45 منٹ is way too short for a test in my opinion...