I have given 4 attempts with impossible consistency of 660 score. Then only thing i changed in my preparation was stamina.
I bought this
expert global 15 tests. The best thing for me was that all questions were new ( I have practiced so long that it is difficult to find new question in any test series)
For constant 15 days, i gave test at same time in morning, even though i felt exhausted and bored.
then after 15 days, i just gave the test and it was same rehersal and woops 700 ( could have scored 710 if practiced quant more)