How much did you score in Quants and Verbal section actually?
You need to practice a lot of Quant questions. Go through OG12 once again.
Refer MGMAT Quant books.
Also analyze which areas in maths need work. Go through BTG forums and check all the questions and their possible solutions and the shortcuts....

Acatlaw55 -

Assuming that you took a few practice CATS, I suggest you go back over all of your Quant questions and review what your main weaknesses were. Don't just look at the correct answers and say "Oh...I see," go back and look at each answer choice and explain WHY it is right or wrong. You have to MASTER the basics. With the short turn around time for retaking the GMAT, I recommend the BTG 60 Day study guide. https://mastergmat.com/ also is a very good resource for getting the basic skills down. Don't forget to throw in some Verbal to keep your skills sharp.

I hate to be a downer, but I think some expectation management is in order. If you don't start studying again until July and plan to retest in August, you may not get the score you are hoping for. Mastery comes from repetition. If you are set on that plan, I suggest taking at least 30 minutes per day to stay in touch with perishable math skills.

Best of luck!