I rewrote a 31 (12/9/10) that I did last year and am currently awaiting my scores for my rewrite. Bumping 10 points when you have a 31 is damn near impossible but bumping 10 points if you have 25 is definitely possible. I was averaging 36 on my FL before my rewrite and am expecting either that or above.
The main thing I did was change the WAY I study. DO NOT, I repeat, DO NOT go about it the same way as you originally did because that clearly did not work for you. Change it up, give yourself the proper time and you will see the increase you want and deserve.
Keep your head up