Ways To Study Effectively
When to study do
The problem of when to study is critical. A good rule of thumb is that studying should be carried out only when you are rested, alert, and have planned for it. Last minute studying just before a class is usually a waste of time.
After for In
I may be able to go after a week.
I may be able to go in a week.Or: I may be able to go in a week's time.
When speaking of a period of time in the future, use in, and not after. Here in means after the end of.