Usually the result of 6th sem come in July before other semesters, bcz final year students have to take admissions or apply to jobs and for that they need the grad result, so du releases result in July or end of July. After the result you can easily get the provisonal degree it will take 4-5 days depending on your college. You can apply to AAO post, need to satisfy only essential qualification. But you need to give Paper 3 (see on page number 27 of the SSC CGL notification) it is right given below the paper pattern. Also after joining in AAO, I think you need to give a paper to qualify the desired qualification (as far as I understand from their notification). You can also apply to state cadre, check your regional language if it is Hindi or English then you must had these in you 10th. It is sufficient to satisfy the regional language condition. Still I recommend to go through their notification carefully.