OGT Test

My class is going to be taking the OGT test in March. I am getting really nervous. The subject I am most worried about is Math. I have never been good at math. I just never get it or it just does not stick in my head. What happens if I get a formula wrong and miss the question? I am not good at measuring angels and I forgot how to multiply and add fractions. I just feel really uneasy. I want to do good on the OGT, but I am afraid that Math is going to bring me down. I am trying really hard in Math and I think I am getting some of it, but getting some of it is not going to really help me. I just have to study harder.