Requesting Advice - Varying scores

First of all I would say that Kaplan CD tests are difficult. I found quants section ok, though needed lot of lengthy calculations. In Verbal, RC's were really tough, all 4 RCs were long, 45-65 lines, and complicated. I hardly got 2 scientific RCs in my last 3 exams. SCs were tricky, simple ones, but tricky. 80% of the time I moved from right answer to wrong. CR was at par with mgmat.

It's very hard to conclude anything from such discrete score. I would say calm down and take another full legth test. I don't see that you've taken any gmatprep test. Are you saving them for last? If its not like that, take Gmatprep test 1 and see how you do. GMAT prep scores are closest to your actual score.

Many people think that difficulty levels of free tests and paid tests are different. I've not taken any free test yet. So no comments on that.

You have exactly 1 month for your exam, that means 3 weeks to decide whether to postpone or not. So don't discourage yourself with this low score. You've done well in past, so may be this was just a prep glitch. Rule out external factors involved in last two tests, if there are any. List out all the verbal questions you got wrong, go back to the concepts and resolve the questions. You have not given section wise score. Solve some problems of section you are good at to gain confidence.

Again I would say, don't jump to any conclusion on so soon, analyze your test results thoroughly. Maybe you only got those questions wrong, which you always get wrong, just that they were plenty in these tests. If this is the case, you know where to improve.

Good luck!