I have read the Powerscore Verbal Book. I still cannot answer the assumption questions reliably. Are there any other good resource for the assumtption questions?
If you are looking for CR strategy:
Powerscore has a specialized book for answering Critical Reasoning questions Powerscore CR
Bible - it is the best in the market.
If you are looking for practice questions:
Supplement 2nd Edition
OG -11 (high overlap with 12th edition)
Once you have completely cracked each and every question in these books and are going strong - you can move on to some LSAT CR
questions (much more difficult) and then GMATprep CR questions towards the end of your prep. That should suffice.
Hope this helps.
GMAT done - a mediocre score but I still have a lot of grit in me
The last 20 days of my GMAT journey