Are you answering these questions under time? If so, I would stop for a bit. Work on the ability to answer them correctly first and then go for time.
On the RC - first look for answers that are out of scope with the passage. This is most helpful when you get the "point of the passage" questions or "The author is trying to say...". If the author is explaning methods used to uncover dinosaurs, an answer that can be eliminated for a "point of the passage" could be something like "The author is trying to show the a large meteorite did cause dinosaurs to go extinct." This type of answer has nothign to do with the passage, but after reading 5 answers and a long passage, it can seem more like a plausible answer.
On the CR - find words that are absolutes. Never, always, etc. These are drastic statements and are rarely (!!) ever supported by the passage.
HTH.