How to improve my score

I got 1400 on October sat. I am international applicant. My reading & writing 600 (30/40 on reading, 30/40 on writing), math 800. Yeah math is okay. However, i wanna get 1500 or higher score. Especially, I wanna get 700 on R&W. Please help me to improve reading and writing skills.

Review your practice tests and if you can afford it, get the Erica Meltzer guide for the NEW SAT reading and the college Panda SAT writing books.

review your mistakes and understand why they are wrong

Okay thanks a lot