take practice tests! I took most of the aamc ones in a month between my first test and my retake...
I took the mcat without taking any practice tests and did pretty bad (25)
Then I took 6 practice aamc official tests over 1 month and didn't really do any more content review and jumped 8 points (33).
While that isn't the best score, that 8 point increase was in just 1 month and due to practice tests.
If I could go back in time and tell myself how to study, I would have acquired even more practice tests and combined content review with like 15 practice tests over about a 4 month period.
Also, I would recommend getting some verbal practice books and doing some passages every or every other day (so when you go a week or so between practice tests, you're still working on verbal inbetween)