There are no formal requirements about solving the exercise problems.
If you want a small bonus for the exam,
you can return your answers in written form (on paper or by email).
This is the only way to get a bonus.
You have to return your answers one day before the exercise session
(that is, on Monday).
Doing 75% of the exercises gives the maximum bonus.
The exercise sessions are meant for
discussing and going through the exercise problems.
Attendance is recommended but not required.
The exercise problems and solutions will appear below (pdf).
The solutions are not necessarily complete,
sometimes just the idea or final answer is given.