You're absolutely correct: a 28 in quant and 24 in verbal should be much higher than a 360. To get a general idea of how the two raw scores combine to create a composite score, check out the scoring charts available at https://gmatclub.com/forum/gmat-scores-83890.html or the score calculator tool at https://www.800score.com/score2.html. The tools aren't perfect, but they're not too far off in most cases.

Based on these, it looks like your score should be somewhere around a 450, maybe just a little bit lower.

I hope this helps!

Sorry AkiB, I completely misunderstood your original post--I thought you were talking about the scaled verbal and quant scores, not the number of questions you got correct. Oops. File under: internet before coffee.

Please disregard my last post, unless you really want to look at GMAT scoring charts just for the fun of it. Brent is absolutely correct: GMAT scores are based on which questions you miss, not necessarily how many. You can miss a crapload of questions and do incredibly well, and you can miss relatively few questions and get a disappointing score. But it's impossible to translate your raw results into a composite GMAT score, unfortunately.

Sorry for the confusion!