Watch subtleties of wording. They complicate an option by adding a qualification. Watch for multiple concepts. All parts of a statement must be correct or the entire statement is incorrect. Use grammatical clues.
All questions follow the basic rules of grammar.
Read the entire question with your answer option and see if it is grammatically correct. Check your work. If there is no penalty involved, guess at any questions you did not answer on the first or second pass. On tests scored by machine, make sure you have followed the directions provided. Erase any stray marks.