US citizen in Pakistan for US unis

Hey everyone. I’m an American Citizen and I studied in the US up until 5th grade then moved to Pakistan.
I did my O levels and A levels here and the thing is that I was private. Meaning that, instead of going to morning school basically I went to an academy or evening school that started after school hours. The teachers I had were all from great schools like Roots, Beaconhouse, etc.
I’m pretty sure I can get letters of recommendations and all but I don’t know how to fill the common app form.
Like what do I add in the school name and where do I include my a level info and all?
Please explain to me if anyone can. Thanks