. ISBN: 0-471-66959-8
Edwards jr. C. H.;
. ISBN: 0-13-258245-7
. ISBN: 972-8298-66-8
. ISBN: 0-8247-6321-1
To go to the first test the student must pass at least one mini-test (unless they have entered the course in the second or third phase); to go to the second test, the student must achieve at least 1 point in the first test and pass 4 mini-tests (unless they have entered the course in the second or third phase) and to go to the third test they should get at least 1 point in the second test, pass at least 6 mini-tests and should still get at least 4 points on the sum of the two tests (if they have entered in the second or third phase only 3 points are required).
">In the last test the student must obtain at least 3 points.
The grade of the "época normal" will be the sum of the ratings of the three tests *.