Hi G.K,

There are a couple of things to think about when it comes to the OG (and in this case, CR questions):

1) The sections in the OG are generally arranged in order of difficulty, so the deeper you get into the set of CR questions, the harder they (generally) become.

2) As you deal with tougher CR prompts, you will be more likely to face rarer (and more subtle) argument "structures" and patterns. The more common, easier logical patterns that you noticed in the earlier CR prompts won't show up on the tougher ones.

3) Since CATs and the Official GMAT are both adaptive, you won't end up seeing that many CR questions that you would consider to be tough (although you'll probably see a couple). Working through 10 tough CR prompts in a row is NOT representative of what you'll face on the GMAT, so you shouldn't get too upset by a 50% correct rate at that level.

4) You can use your CAT results to get a sense of your true abilities. It sounds like you're pretty good at CR right now, so there's probably not too much to worry about. CR typically represents a smaller set of questions on Test Day than RC or SC, so for a strong overall Verbal score, you need to make sure that you're ready to handle those larger categories too.

If you can answer a few questions, then I'll be happy to offer any additional advice that is applicable:
1) How have you been scoring on your practice CATs?
2) What GMAT resources have you been using to study?
3) What is your score goal?
4) What is your Official Test Date?

GMAT assassins aren't born, they're made,
Rich