1) There are lots of free online GRE practice Tests available. Take one of the test without any distractions and make a note score in Verbal and Quantitative sections.

2) For the questions you have answered wrong, make sure you find out why that particular answer was and find the right way to solve the problem. If you happen to learn a new formula or words, make a note of it in a separate notebook, one for Verbal and one for Maths.

3) Also, spend at least 1 hour per day for GRE Vocabulary from Barron's GRE book. It has 50 Word Lists. Try to remember at least 1 word list per week. So, every week 50 to 100 new words can be remembered.

4) Week 1 read the first word list, Week 2 revise the first word list and then start learning the Second Word List. So, that new words will stay in memory.

5) Best way to remember new words is to form a sentence for each word. (Other technique is to use Flash Cards)

6) Next, take an GRE Practice Test again and see how much you score, and for mistakes, again evaluate what went wrong. This is the best way to learn new maths formulas and at same time score will increase for every practice test.

7) No need to worry that scoring less in GRE practice tests, every student initially has the same problem. Spending at least 1-2 hours per day for first few weeks from now will get you going. In 2-3 months time scores will gradually increase.

8) So, the key to improve the GRE Scores/skills is to practice daily.

9) Majority of the students make the mistake of not finding out the right answers for the questions they go it wrong in GRE Practice test. This is the most proven way to improve your scores in GRE. For instance in first GRE practice test lets say score you score 1000 and 2 months later in your GRE Practice test if you score around 1000 again, then the approach taken to prepare for GRE is not the right way.

10) If your score doesn't improve, try following different approach for GRE preparation.