GMAT Strategy

I have been preparing for my GMAT for the last 2 months, I joined a classroom course at princeton review. My mock gmat scores at Princeton were

Test 1 610 (Q-39, V-36)
Test 2 600 (Q-43, V-30)
Test 3 610 (Q-39, V-35)
Test 4 620 (Q-45, V-31)
Test 5 560 (Bigtime screwup)
Test 6 610 (Q-40,V-34)
Test 7 690 (Q-45, V-40)

After these, I took Manhattan GMAT, my scores have hovered at
CAT 4 - 640
CAT 5 - 640

And finally, i took tests on GMATPrep
Test 1 680 (Q-48,V-35)
Test 2 720 (q-50,V-38)

I have been studying for 5-6 hours continually for the last 20 days. I know no mock test can give me the exact idea of how well the real test scores will be but Im freaking out now with the test date coming on 5th February.

Any advice will be appreciated, thanks !