Present perfect, past simple (правильно употребить) I (leave) school last year. And I (already|finish) courses in computer studies. I (know) him since I (be) a little girl, when we (play) together after school.
I left school last year and have already finished courses in computer studies. I have known him since I was a little girl, when we played together after school.
I left school last year and have already finished courses in computer studies. I have known him since I was a little girl, when we played together after school.