It all depends on your preference. The 60-day plan is supposed to make your learning more organized. Studying both sections simultaneously also has many advantages. One of them is that when you feel fed up with studying one section, you can go through some material concerning the other section and thus you might be able to cover more material in a shorter period of time.

I would also recommend that during the days devoted solely to the verbal section you do practice a little solving quant questions. It shouldn't be too many, around 10 questions should be enough.

I've personally found that if I don't work on quant for a few days, I tend to get rusty.

yes .. it does get out of sync.. Thanks Katia.. will follow your suggestion..