Form and rules
How it works
On time means at the scheduled or planned time: The train left on time.
In time means early enough before a deadline or bad result: We arrived in time to catch the train.
At the end refers to the final part or point of something and is often followed by of: at the end of the film.
In the end means finally or after everything has happened: In the end, we stayed home.
Do not use in the end of. Use at the end of + noun, but in the end by itself.