hey!

yes you can pursue BA or BSC after your diploma. also, there are many universities which provides an option to directly enter into second year of the undergraduation degree (lateral entry) such as christ university banglore, st. xavier collegemumbai, hindu college etc.

But you cannot writeany government exams such as UPSC , for these examsyou need to follow 10+2+3 pattern.

Kindly mention the details of your diploma, so as to get more detailed information.

Thankyou