The answer is usually taking another CAT, although, there can be exam taking strategies to learn (timing is often easily fixable). The exam strategies are too lengthy to get into here, but we can address other thoughts.
1) Feb 11 is definitely too soon if you are looking for 700, unless you have a pending application deadline (then hope you have a good day)
2) As for how to study - learn with the intent of mastery. Review answer choices of right and wrong answers thoroughly.
If my response helps, please add throw me a kudos.
Jim Kernan is the Director of GMAT Operations at Stratus Prep and author of GMAT Materials for GMAT Prepster.