low gmat score

I think my main issue is that I get nervous when I take the GMAT and I end up clamming up and messing up the pacing.

I usually score 44-45 on quant on GMATprep and high 20s on my verbal. I need to work on verbal. CRs and SCs are killing me.

OG-best questions but only questions in the end are harder ones.
Verbal- heard MGGMAT is the best.
Quant- as long as I get pacing down and don't make stupid mistakes i'm sure i can get 45+.

I've already taken the gmat twice and received the same score. This second score has really hit me hard but I just know i can do better. I do much better on paper than on the computer. I'm trying to study smarter..any advice?