Can you tell me whether it would be advantageous to spend the most of the time on the first 10 questions in each section, to get the best score, since it sounds like the first 10 questions are the most important?
Yes, the first 10-15 questions affect your score the most. Also, if you get easy questions wrong, it has a significant negative effect on the score. if you get a series of questions wrong, that too reduces the score.
that said, i dont think you should spend MOST of the time on the first 10 questions. many many guys have done that and finally ended up guessing on the last 5-6 questions.
Sure, be careful, but do that for all the questions. if you are looking for a 49-50 on the quant, you need to do consistently well, not just on the first 10.
hope this helps