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ABOUT HOMEWORK
Doing just the practice tests in not enough since practice tests are only similar (in varying degrees) to the actual tests. To become versatile, you need to do all HW assigned.
Note: When HW is checked 10% of each test grade is for HW (usually 7% for HW assignments and 3% for the practice test). Thus if your raw test grade is 80 and you did the HW and the practice test(s), your final grade for that test is .90 x 80 + 10 = 72 + 10 = 82
POINTERS
You need to show work where feasible when doing your HW. Be sure to look up the answers.
Some complete solutions may be on your instructor's Web site and/or in the student solutions manual (if available). Answers are in the back of your text.
Doing your HW properly will be good practice for showing your work on tests.
Instructor's are impressed by good homework