the powerscore course is woefully inadequate in RC,
but some generic tips we got from our dude:
expect a passage on:
the author will (most likely) never had a negative attitude in the minority passage.
mark passage while reading whenever the author gives his opinion.
mark dates, times, lists, examples, etc
try to become familiar with the different types of questions usually used in the RC section, most will basically be must be true questions where you should find the specific line # that makes you think an answer is correct.
while reading the passage, try to anticipate what would make a typical question
brain dump each passage and move on to the next