yes princetons CR technique is pretty good. It is also very clear. They have done a good job of explaining what to look for.
The LSAT book that I used is called Nova's Master the LSAT.
He is what i did for DS with inequalities and number properties.
Suppose the question is a YES/NO question like is x >0
The I worte down is x>0 OR x<0. Thus I would not miss an affermative NO. This I read in One of the posts in the Club. It proved to be very usesful.
The second thing that I did was I always imagined a number line. Rather than distinct values to plug in.
If I plugged in distinct values.I made sure I did Positive numbers, negetive numbers , fractions and 0 . when ever applicable.
Finally I also went back to the question stem to see weather my answer was in line with what exactly was given and what exactly was asked.
For SC. You are doing the right thing. There is no better book than MGMATs SC guide. I made very good notes from the book. Pretty much every thing in the book is important .. But I still made notes. I tend to remember things better if i write it down. So before every test my routine for SC would be to go thro my MGMAT SC
notes. I did this on the day of the test as well. Got up and revised my notes early in the morning this made up for good warm up as well.
Keep us posted on how it goes.
I also like Princeton's technique for CR. Have you reffered to this book? The strategy worked for me and helped improved my scores, i still commit mistakes on Inference questions, but the others i can nail.