Although she started college late, my sister ended up graduating #1 in her class.
The phrasal verb to end up means to become (eventually). It is an inseparable verb.
Here are some examples:
If Julia works hard she will end up a great lawyer.
They will end up very famous if the magazine interviews them.
To end up can also mean to arrive (particularly after a long time).
We end up eating Italian food when we cannot agree on anything else.
If you keep working hard you will end up passing your English exams!