There is a list of free tests compiled at gmatadvice.blocked

Very impressive.
Hope you can get into the school of your choice with this score.

Jamess

No. You need good advice, but you need it badly.

I guess take some practice tests and read up the theory from one of the books. It should be enough to get a ~500 score.

If timing was your problem, practice tests should help to address it.

May I say the ebook on Critical Reasoning

This is exactly the strategy that I prescribe for scoring above 700.

To understand why is it so, read the link below.

You could have score 750/760, had you got a perfect quant score.

Find out how below.

Given your strong quant background, I would suggest you to first gain a perfect score in it, 51.

Then spend time on verbal.

Btw, quant boosts your score more than the verbal. see below link for explaination.

In this type of question you need to confirm of the link suggested in the qeustion stem: that increase in fees will reduce the trash.

C) clearly eliminates an alternative explaination where the official trash reduces but the illegal trash increases.