I secured 74.76 in APTET from the BC-D category. Am I eligible for DSC recruitment?

Yes, with 74.76 marks in APTET and being from the BC-D class, you are eligible for DSC recruitment.

The minimal qualifying marks for BC category is 50% (75 marks), and since you are very near, your score remains considered qualified due to rounding.

To observe for DSC, you furthermore may want:

A B.Ed