Andrea I. answered 12/08/20
Hi Raquel- it may help you to check out this visual with percentile ranks. According to the GMAT's official website, the difference between a 500 and a 630 is 40 percentile points. What that means is by scoring a 500, you performed at the 25th percentile (which means the same as, or better than, 25% of test takers). Getting a 630 is equivalent to scoring at the 65th percentile, which would mean scoring better than 65% of test takers. This is a big difference.
A lot can be learned in a little bit of time with enough effort, but there is no substitute for working to strengthen your weaknesses and taking multiple realistic practice tests. Given that you're so close to your test date, I would still recommend working on strengthening your weaknesses and practice pacing yourself with full-length practice tests. If you'd like more specific advice, feel free to reach out.