Took a Break of a Month While Studying

Hey Guys,

I was preparing for GMAT for a couple of months back, and during that time I was working on my weaknesses in Quant and Verbal. Due to work pressure and some personal reasons, I couldn't study for almost 45 days, and now I need to get back on it and give the exam. To give a little background, My first diagnostic test was terrible and I scored a 530, then. I improved my score to 630 in a month, and I was using Crack Verbal's online material and Magoosh's online material.

Please could anyone help me with what strategy I should use here? Should I give a diagnostic test again and then start revising topics?
I am hesitant to give a diagnostic test as I feel it would discourage me before I get on to it.

Also, What study plan should I use here? Should I start with Quant first and work on it and then pick verbal (SC, CR, and RC) or work on both of them parallelly?
I am aiming for a 740 score, and want to give my exam in the next 60 days. Back then when I was studying, I was doing fairly good in Quant - Easy and medium difficulty level questions and was drilling down more on harder questions.
Whereas, Verbal was overall giving me a tough time, particularly RC. I would be grateful if someone would help me guide through this.

Thanks.