The first time through, mark only those answers you know well. Keep working through the list. Eliminate possibilities each time. Grammar clues can tell you some of the answers. Singular subjects require singular verbs.
Plural subjects require plural verbs.
I get nervous at the thought of a test. Taking a test makes some students tense and anxious. A little bit of anxiety is useful. It helps you focus your attention and do well. Too much anxiety, however, is not helpful.