Knowledge is a bridge built piece by piece, examinations and tests are the stress we put on the bridge to assess its integrity. You can't expect people to use your bridge unless you've tested it enough, and the same goes for knowledge, to know if it's complete you need to test it over and over again. , and this is my method: I teach the students how to build the bridge (knowledge) by doing as many exercises as possible, to try all the possibilities and be sure that our bridge will not collapse. Do not worry ! we'll start with easy exercises, quick lesson applications, then move to the next and next level until you feel comfortable working on much more difficult problems on your own.