Shohinee
Thank you! I have been taking realiable practice tests, but I haven't taken the gmac mock test yet.
The official practice tests are the only reliable practice tests. If your scaled scores are in the ranges you mention, no accurate test should ever be giving you an overall score in the 500s. That would be miles off, and I honestly wouldn't have any faith in a test that produces a '560' with those Q and V scores. Even with the lowest possible scores in the ranges you provide, you shouldn't ever see a score below 610 (and 620 is more likely), and if you hit the top end of your ranges, you should be around a 700 or 710, as AjiteshArun said above.
It can certainly be a good idea to save your official practice tests until after you're deep into your prep, because there's really no need to get an accurate score estimate until you've studied everything. But when you have reviewed everything, and feel confident about your ability, and if you either want to practice your pacing strategy, or want to assess yourself so you can decide if you should sign up for a real test, the only tests that give realistic pacing practice and trustworthy scores are the official ones. If you do use any other tests, don't read too much into the scores they produce.
There is, incidentally, a huge difference between a V36 and a V44. Since you're not using official practice tests, the variance you're seeing is probably just because of the quality of the Verbal questions on your tests. But if you saw scores that different on official tests, one of them would almost certainly be an outlier that didn't fairly represent your ability. A V36 is very good, and a V44 is absolutely outstanding, so again as AjiteshArun said above, you're doing very well in Verbal. Good luck!