Practice Midterm 1 : You need not worry about the following problems: 1c, 3, 4b. 1e is referring to the unit vector in the direction of u. For 4a, don't worry about expressing the plane equation in multiple forms.
Practice Midterm 2 : Problem 1 is the only problem that is covered in lecture as of 7/13/2017. The rest will be covered, likely prior to the midterm, and are likely fair game.