that's a tough question unless you don't provide us with some score breakdowns. What I can say is that scores below 600 most often show some lack of understanding of the basic concepts. So based on the materials you have, I would try to solidify the basics for the next couple of days (2-3 max), then do a CAT and see if I have moved (best download the GMATPrep official software by GMAC, because that's the best software to gauge your level). Then in the final days till February 7th please try to work out what are your strengths and weaknesses. Work only on areas which you can significantly improve and solidify in these 4-5 days, and do not
loose time on complex areas (e.g. permutations and combinatorics) which you can not improve in 4 days time. Do a final GMATPrep CAT 2 days before the exam and do not study on the day before the exam! Get high quality sleep!
In the test center - skip questions from your weak areas and give yourself more time for strengths (provided you can't solve questions from strong areas within or below time limits of 2 mins).
Wish you good luck! I'll be happy to help you further! Kudos?
All the best!
Thank you very much for reading this post till the end! Kudos?