How to present your solution:
Provide explanations for your solutions/calculations.
The final result (a number) is less important than the reasoning and methods used to reach it.
Write your answer as if you were writing to a fellow student, not assistant or lecturer.
It is okay to make mistakes! Do not be afraid to present your solutions.
If you can't attend some of the exercise rounds, for example due to sickness or some other good reason.
You can still earn homework and attendance points, if
(1) you inform your group TA about the absence beforehand
(2) send well written solutions to the homework and in-class problems to your group TA before the exercise session starts