htbreme
1. What could be the reasons for this results?
2. Do you have any tips in order to boost concentration during the exam?
3. What should be my focus from today to monday?
4. What is your general opinion on Manhattan CATS?
I have taken the liberty of numbering your questions for easier reference.
1. Manhattan's online tests are generally considered more challenging than the GMATPrep - especially for math. It's perfectly normal for you score to decrease in this case. It
may also be sign of burnout, though, so be careful!
2. My advice would be quite basic: relax for the weekend, get good rest, bring snacks to the test center, stretch and splash cold water on your face during the breaks, and try to remain calm. See
GMAT Snacks and
GMAT Anxiety threads for further information.
3. I would only focus on the errors made in the latest CATs. But today is Friday and the test is Monday. So after this light review, it's probably better to take the weekend off and relax to ensure that you're mentally prepared for the test.
4. Manhattan's CATs are a good and challenging resource. Perhaps things have changed, but these were ranked (a distant) second to the GMATPrep when I took the GMAT in 2010. But nothing is better than the GMATPrep.