The purpose of college is that you study and get good grades to get to university and have a high pay job and retire early and enjoy life
Because the sun bleaches and destroys the melanin in your hair, and while it also destroys the melanin in your skin, your skin cells make more, causing your skin to get darker.
We need a bit more context lol
It's going to differ between people. Some people will have trouble staying focused on the prompt. Others will find difficulty in supporting their ideas. Still others may be unable to utilize grammar effectively.