You can increase your grade by solving these exercises. You can solve as many tasks as you want. The exercises can give you at most 15 exercise points, which can increase your total points by 10 p.
Notice that in most exercises you have to recall or find some new information. You can find brief explanations and links on our course material (check especially "Further notes" after presentations). However, I strongly recommend to read Russell-Norvig or some other book!