PSAT & Difficulties with Math

So I’ve been studying for the PSAT and my scores have come out like this: Reading/Writing - 690, Math - 580 (so 1270 overall) twice. First I was wondering if these scores are generally below average, average, or above average for the PSAT and what they would convert to for the SAT. Also I’m having trouble with the math and was wondering if there are some tips anyone could give me for what to study.