First of all, a 720 is a great start! Second of all, of course you can improve your GMAT quant score!
A Q48 is a pretty awesome quant score, so with some more dedicated prep, you probably can improve to a Q49+. Now, to increase your quant score to an advanced level, you need to study each topic "with a fine-toothed comb" to determine your exact weaknesses.
For example, if you are reviewing Number Properties, be sure that you practice 50 or more questions just from Number Properties: LCM, GCF, units digit patterns, divisibility, remainders, etc. Once complete, do a thorough analysis of each incorrect question. If you got a remainder question wrong, ask yourself why you got it wrong. Did you make a careless mistake? Did you not properly apply the remainder formula? Was there a concept you did not understand in the question? By properly analyzing your mistakes, you will be able to more efficiently fix your weaknesses and in turn improve your GMAT quant knowledge. Number Properties is just one example; follow this process for all quant topics.
Each time you strengthen your understanding of a topic and your skill in answering questions of a particular type, you increase your odds of hitting your quant score goal. You know that there are types of questions that you are happy to see and types that you would rather not see, and questions that you take a long time to answer correctly. Learn to more effectively answer the types of questions that you would rather not see, and turn them into your favorite types. Learn to correctly answer in two minutes or less questions that you currently take five minutes to answer. By finding, say, a dozen weaker quant areas and turning them into strong areas, you will make great progress toward hitting your quant score goal. If a dozen areas turn out not to be enough, strengthen some more areas.
Accomplishing this end could take doing dozens of questions of one type, then dozens of the next, and so on. When you do dozens of the same type of question one after the other, you learn just what it takes to get questions of that type correct consistently. If you aren't getting close to 90 percent of questions of a certain type correct, go back and seek to better understand how that type of question works, and then do more questions of that type until you get to at least around 90 percent accuracy in your training. If you get 100 percent of some sets correct, even better.
So, work on accuracy and generally getting to correct answers, work on specific weaker areas one by one to make them strong areas, and when you take a practice GMAT or the real thing, take all the time per question available to do your absolute best to get right answers consistently.
The GMAT is essentially a game of seeing how many right answers you can get in the time allotted. Approach it with that conception in mind, and focus intently on the question in front of you with one goal in mind: getting a CORRECT answer.
In order to follow the path described above, you may need some new quant materials. Thus, take a look at the GMAT Club reviews for the
best quant courses.
Please reach out with any further questions!