How can I better prepare myself for the PSAT, which is in in about 6 days?

I'm only a Sopre, so it doesn't count. But I was hoping to do my best on it anyways, so I've studying, but I've been lazy about it in the last past few weeks. I weakest subject is math, so I know there is a high possibility of me not doing well on it due to the math section. I'm literally terrible at math, I mean I'm still in Algebra 1, which is not due to failing but to other cirstances. So I'm trying my best to prepare myself for the math section, I have a PSAT study guide. What advice can you give me for preparing for the PSAT and doing my best. Even though it won't count, I'd still like to do my best. I mean I did pay to take it, and it was my choice. I'm hoping taking this test will help me prepare myself for the SAT. So what advice can you give me?