Take an exam before starting out so that- one, you understand where you stand. Two, you can determine your strengths and weaknesses. Three, it would give you a lot of familiarity with the type of questions. Four, you can evaluate what other things are important such as concentrating for a long time etc. You could take the power prep here. (Just remember, power prep is of no use taking after you have done OG especially if you are one of those with good memory)
2. Start out with Princeton – complete basics of all the verbal section. Quant could be managed at the end. Practice questions.
3. Take a test again
4. Complete OG – for SC – Manhatten SC is the the best – Solve the OG questions – assimilate the explanation – the explanation is succinct but not up to the mark. Believe me, you would take a lot of time understanding the explanation itself. CR and RC you can guage the standards from OG.
5. Take a test again
6. Go for Kaplan.
7. Take a test, see your weaknesses. Use 1000 SCs, 1000CRs, and 1000 RCs for practice to overcome them.
8. Take tests in the final 2 weeks before the GMAT.
9. Appear for the exam.