I give 12 quizzes during the semester, the top 10 of which count.

I know how to drop quizzed and handle this.

But I would like some of the quizzes to be two parts, where the total score is the sum of the score from the two parts.

In particular, on some quizzes (which are worth 20 points), 15 points some from a subquiz for which the students have 90 minutes and can take only once. The other five points come from a subquiz on which the students have unlimited times and attempts (numerical problems).

So for example.

Quiz 1 (20 points)

Quiz 2 (20 points)

.

.

.

Quiz 6 (20 points)

Quiz 7a (15 points )

Quiz 7b (5 points)

Quiz 8

.

.

.

Quiz 12

I want the best ten scores where the one considered to be dropped in the sum of 7a and 7b.

How can I add the two subquizzes and denote as Quiz 7?

Arne, the only thing I can think of is to create an assignment placeholder for Quiz 7 that's in the assignment group with the other quizzes (worth 20 points). Once students are done taking Quiz 7a & 7b, add up their points and enter these points into "Quiz 7" assignment. Then switch Quiz 7a & b to practice quizzes - this will make it so they're non-graded and won't impact the gradebook (or be counted twice). I know this might take a little work, but I think ultimately it will do what you are wanting.

Hope this helps!