This is the 4662nd most frequent Russian word.
дополнительных
"Additional."
In this sentence, 'дополнительных' modifies 'материалов' (materials), implying that these are extra or supplementary items needed for the exam.
Не забудьте взять дополнительных материалов для экзамена.
Don't forget to bring additional materials for the exam.
Here, 'дополнительных' describes 'условий' (conditions), indicating that these are extra rules or requirements added to the problem.
В этой задаче есть несколько дополнительных условий.
In this problem, there are several additional conditions.
In this context, 'дополнительных' applies to 'заданий' (assignments), meaning these are extra exercises provided in the course.