jumping from 550 to 600 in a month is quite achievable.
For SC, i would suggest you to go through the appendices of kaplan
's verbal workout and ofcourse Manhattan, which is considered as SC GOD by many. Just reading or going through manhattan sc will not help, you need to practice the problems in OG and read the explainations throughly. you should understand why you got a question right or wrong.
I believe with lots of practice and some smart preparation you can easily achieve 600.. best of luck