DS and CR Help

[modesto2]

I scored a disappointing 670 on the GMAT last week and am studying to take it again. I've determined that data sufficiency and critical reasoning are my two weakest subjects.

What suggestions do you have for books or strategies to improve these two areas? Prior to last week's test, I studied for three months with Kaplan Premier and OG12. However, I don't think I spent enough time analyzing the OG answer explanations.

Will studying the OG explanations be enough to improve my CR and DS skills?

Thanks for your help.

[sudi760mba]

Other posts have said it so far, that the biggest improvement would be to spend time reviewing CR and DS answers and understanding why other choices would be wrong. Although it's older, I would say take a look at the OG 10 as well for additional practice.

I was struggling in CR until I actually did all the CR questions in the OG and then reviewed the answers. I realised a pattern especially in when 'weakening' questions were in play.