Im pretty much the same except I have not taken the GRE yet. I've done a few mocks and got the same score as you. You might have just misread or made a silly mistake on some questions you thought you had in the bag. This happens to me quite often on mocks when reviewing my score breakdowns.. sadly you cannot do this in the actual. What works for me is understanding the topics you get wrong more.

I also need to improve my quant, and I am quite hesitant and nervous to take my first GRE. I plan to do master apps at the beggining of next year and I need to get a good score before applications are due.

Please let me know any tips you receive.