I GAV 1 RECENTLY..what should i give next..?CS or CK?

its best to do whichever you are most comfortable with, but always check the usmle website to make sure there are no restrictions on which you must do first. possibly, the ck is better to do first, since you just finished the step 1 and are in a "groove" with your study plan and accomplishing the questions in the time limit. you'd be surprised how fast you forget how to do that,, and then you have to start from scratch. studying for the ck also helps you in the cs, so its all good.

best of luck