HELLO Aspirant
The 10th marks sheet is the base for everything not only going to higher studies if you want to make your passport you should have 10th marks card.Now coming to your question the polytechnic college which offers diploma in engineering branches is done after class 10th so its obvious that need of 10th marks card is important. Not only for diploma if you want to pursue science or commerce 10th marks sheet is compulsory.
HOPE IT HELPS!!