What am i going to do!!

<p>Hi guys
I really need your advice cause I took the May sat and got 1680 then took it again in June but just got 1590 ( I didn't know why). Now I'm going to take the test in Oct. I still practice a lot but honestly I'm really afraid that I coudn't not get a much higher score ( about 2000 which I desperately need).
What should I do? People say practice makes perfect but why it didn't work for me?
Thanks</p>