over two or more future sittings, yes, i think that’s possible. but just from one sitting to another, that would be (As others have said) unlikely. it’s not uncommon to see an increase of about 200 points in between sittings, but a change of ~300 or more takes multiple re takes. to give you an idea, i went from 1980 to 2240 over three different sittings.
i recommend the official SAT review book; some of my friends have also had good experiences with test prep classes such as Test Master’s, and i personally used lots of apps (like the Official SAT Question of the Day) and websites (sparknotes and the collegeboard website) to review in my idle time as well.