You should try to help your friends.
Dan's friend says they really need Dan's help to study for their English exam.
Dan wants to respond to his friend.
Dan says he'll try to help his friend study for the test as best as he can.
Dan says he won't help his friend with their exam because they're probably not going to pass the class regardless.
Dan's friend does fairly well on their exam and manages to pass the class.
Dan's friend does poorly on the exam and fails their English class.