An issue I had when I first started taking FLs. Hard to get rid of. I have some tips that work well for me. Move more slowly on the math and write everything clearly. Easier said than done, but when I started doing this, I rarely made math errors (scientific notation-type errors). At every stage of any math problem, ask yourself what variable you just solved for. Is this the resistance of this one resistor or of the entire circuit? For conceptual problems, I try to link them to either some rule or the passage. If I can't somehow make any sense out of an answer choice based on something that I learned or what's in the passage, it's likely not right. And then lastly, and this is seemingly the most useless answer, but just have confidence because you know you've worked hard. The more brainpower spent doubting yourself, the less available to spot tricks and traps.