Assuming, I am at 600, how many hours do you need to get to 700?
There isn't an answer to that question that applies to all people. It's going to be a decent number of hours, because 100 points is a big jump, but there isn't one number I can give you.
Keep an eye out for signs of mental fatigue. If you need to take a day off, do so. Don't stress out about taking that day off - then you won't come back refreshed the next day!
When was the last time you took a practice test? If more than a month, or if you took it under very non-official conditions, then take another (under 100% official conditions, including essays).
Then go look at that article I gave you last time (setting up a study plan). That has a link to an article that you can use to assess your performance, which will help you to set up your plan.
Because you have access to the class lectures, you may want to set up a modified version of the course - basically doing it again, in the same order (and with the homework this time :) but modified in the sense that you go faster on your strengths (or move on to harder material) and spend a bit more time on your weaknesses.
Given the timeframe, you may also need to decide that there are certain weaknesses you're going to just leave. That's fine as long as the weaknesses are not commonly tested (eg, combinatorics and probability). You can't, though, just "leave" exponents and roots or algebraic equations (if those are weaknesses) because they're very commonly tested.
If you'd like, after you've assessed your test, you can tell us your strengths and weaknesses and we'll tell you which are more vs. less commonly tested. Then, you're basically going to follow the main syllabus, but you're going to adjust how much time you spend on various things based upon your strengths and weaknesses.