Set/put one's mind to/on something

1.I’ve set my mind on getting a university degree.

2.I’ve set my mind to getting a university degree.

3.I’ve put my mind on getting a university degree.

4.I’ve put my mind to getting a university degree.

?5. You have got to put your mind on what you have to do.

6. You have got to put your mind to what you have to do.

I'm curious to know which ones are correct English and about the differences in meaning.