Help!!!

<p>Any of idea as to how I can improve my SAT scores. 620 reading, 660 math and 580 writing, with 8 in the essay.I took it in December 2013 and plan on retaking it in October 2014. Any ideas as to how I can improve my scores. I have a large time frame but cannot devote more than 1/2 an hour to this study every day. Please help. After I took the test, I actually thought I could score 2200. Turns out I was wrong big time.</p>