To get the most of your study time, try to study only when you know you are getting it. For example, after a long day's work, it is quite normal that you don't feel like going through odd looking RC passages. However, that time may just be suitable for quickly going over a couple quant problems and refresh your memory. If you are a morning person, try to read the stuff which is hardest for you in the morning. Even if you can devote an hour during your best time of the day, it will be worthwhile.

As you have talked about taking breaks, it is absolutely necessary. If you keep pushing your brain without giving it time to relax and grasp everything, it may fail or revolt. This is particularly important when you are close to the Test date. You must taper off your study schedule during the last week of your preparation and let your brain rest a little bit and prepare for the ultimate battle.