I Will suggest you to follow strategy 1
Manhattan SC Guide
For i=1 to end
1. Study "chapter i"
2. go to grockit.com and schedule game for "chapter i" with difficulty level easy, If doing good then increase the difficulty to "medium" else go to next step
3. re-read the "chapter i" if you are doing bad and goto step2
4. else goto next chapter and repeat the above steps. (Dont do teh hard problems for now!)
Once you are done with all the chapters then schedule a game in grockit.com for all the topics and all the difficulty levels taken together.
Then you can do things from gmatclub. You can find a list of gmatclub tags in my signature.
Once you are done with everything then to strengthen your concepts you can go through Thursdays with Ron Videos. (link in my singaturE)
Once, you are done with everything then you can go to OG and practice! and do questions from grockit and gmatclub.
Hope it helps!
Good Luck!