Difficulty Order in OG11?

Ian Stewart wrote:Yes, the Official Guide questions progress from easy to hard. If the early questions aren't challenging for you, that's a good sign, and if the later questions still aren't challenging, that's a very good sign. If you have time, I'd suggest doing all of them, but if you don't, you might want to skip ahead.

Ian, I solved all of the OG Quant books in both books and my hit rate is 98% and my average timing is 1:34 seconds.

I got this data from my OG tracker.

I am having hard time to push my quant score from 49 to 50 and 51.

How do you score 51 ?

During my CATs, I usually have no mistakes till 15th question and I get 2-3 wrongs between 15-25 and since I get by tougher and tougher questions, and I guess couple of questions with POE if I am falling behind and I usually find myself barely finishing the section STRONG and ON TIME.

Any recommendation ?

Any recommendations, then, for the most efficient way to practice if I start to make an unacceptable amount of errors around problem 110 of 250 in the problem solving section? Time is not an issue, really - if I know how to solve the problem I can do it quickly enough. But from question 100 to 115, I simply did not know how to approach 4 of the questions!

I'd like to get my quant score up as high as possible, ideally, but realistically my goal is to shoot for a minimum score of 680. I regularly score in the 95+ percentile in verbal, but average mid 30s in quant.