In the society of education we live in, (Or at least where I live) showing an kind of measly effort can get you a decent grade. In elementary school, tests are easy, and most things are completion grades. In my middle school, most homework is just a completion grade. You can also get at least a B on a test my looking over noted a minute before tests. It's obviously not like that in HS/College, but putting in a decent amount of studying can get you decent grades. As for english tests, make sure you use proper grammar, and try to relate the words to other words you've heard. Chances are, you heard the word before, it's just in the back of your head somewhere. (Congratulations on being grammatically correct on the title. Most people automatically put bad, but badly is correct, as adverbs modify verbs)