How to improve my GMAT: 720 Q51V38 in 3 weeks

Hello,
I have been studying for the GMAT every week since the beginning of October, I finally got the courage to take the test and I got a 720 (Q51V38).

The results were a bit below my best overall performance in my last Mock tests in Which I got:

The economist:
Mock 1: 760 (Q51V43)
Mock 2: 750 (Q51V42)

Manhattan
Mock 1: 750 (Q48V44)
Mock 2: 750 (Q48V45)
Mock 3: 730 (Q51V38)
Mock 4: 740 (Q46V45)

Kaplan:
Mock 1: 710 (Q49V39)
Mock 2: 740 (Q50V42)
Mock 3: 720 (Q49V39)
Mock 4: 710 (Q49V40)
Mock 5: 750 (Q50V43)

GMAT
Mock 1: 720(Q51V35)
Mock 2: 720(Q50V38)

I believe I may have exagerated on mock test during the last weeks and that might not have been the best strategies, I still have 4 mock tests from GMAT to take and I believe it is a good stratey not to wait so much until the next time I'm taking the test (maybe 3-4 weeks)

What should I do now? Which material can help me? My target score is a 750-760