I focussed more on my weak areas, which, in my case, happened to be Data Sufficiency and Sentence Correction.
Also, in my first attempt I would try my best to answer each and every question which put the time available for me to answer the later questions at risk. This time around, I identified those that were going to take too long for me answer, took an educated guess and moved on. This, in my opinion, helped me the most in improving my score.
Besides these, I did not change anything else. Good luck!