I can't do math and I feel so stupid

Hi everyone.

I keep trying to do my math tests and keep getting awful scores. My math teacher has already helped me so much, and I thought I understood enough. But I keep getting things wrong anyway.

It's always been like this with math. I always just scraped by with a C-, and now I'm in high school. I'm not even gonna pass.

The teacher is so nice and answers all of my questions until I understand what I'm working on, but then I go to do the test, and I don't even get half the questions right.

I feel like I'm not practicing enough and not trying hard enough. I feel like I should be smarter than this. I'm just so frustrated with myself, and I can't really take a break because this test is due tonight and I already got an extension.

I just feel like I'll never be able to pass a real math test.