Dear Learner
The students are evaluated based on the best of 8 assignments. So only your best 8 marks of the assignments will be counted.
example A student has submitted only 10 out of 12 assignments so his best will be 8 best scores of assignments out of 10.
if a student has done only 8 assignments then his all 8 assignment marks will be used.
All these details are mentioned in description of the course
Hope this clarifies your doubt.
Thanks
Prashant (TA)