Hi Eddie,
You mentioned that you've enrolled in a GMAT Course - has that Course started yet? When is it scheduled to finish?
Have you taken any FULL-LENGTH CATs yet (as part of the Course)? If you have, then how have you scored (including the Quant and Verbal Scaled Scores)? If you have not, then do you know when you will take your first CAT?
Your score goal certainly seems reasonable, but until we have a 'baseline' score (for comparison purposes), it's tough to offer any specific advice. 70 days may or may not be enough time for you to get up to the 600+ level.
GMAT assassins aren't born, they're made,
Rich