Like I said, if you're already good but just trying to refresh, it's totally possible. You aren't going to pick up and master new concepts in that short of a time period unless you're quite exceptional intellectually. It isn't impossible, it's just highly unlikely. Also, most people are lucky to bump up VR at all in 6 weeks, as it's more a score of your base reading ability that you've built over the entire rest of your life up to this point. You can't just suck at reading/not read for 21+ years then decide you're going to spend six weeks doing it and suddenly be in the top quartile of VR scores.
You might be able to do it. Going from a 24 to a 30 is way more doable than going from a 30 to a 36. Also, I highly recommend TBR if you aren't using it already- I had to study at a pretty accelerated rate, so I'd go through one TBR and one EK chapter every day until my test, along with an official AAMC practice test every 3-4 days. I did have a bit longer than you though.
6 weeks is a lot of time, it would also help if you did more content review. I would go as far as to say read through science textbooks and lab manuals, but because the MCAT tests on random topics you won't ever really be ready. I suppose you can practice reading new content (upper level science courses) and understanding it faster, since that's probably what you'll need to do when they throw new topics at you.
