I had a similar issue to you, but what you need to remember is that the passages are designed to test your reasoning and reading abilities, so some tips from my side would be:

- Work on overcoming your "mental block" with these problems. The questions are not designed to test your knowledge on finance or law or anything as such, but are designed to throw your thinking off balance by introducing complex technicalities

- Make notes as you read every sentence. I found this strategy to be an excellent one, specially for the longer reading passages. Try and break down complex sentences into simple ones, if possible in isolation from the others following it.

All the best with your GMAT my friend.