Hello buddhuag992,
You can't go for two courses at a time, in that case only one course will be stated as valid. Either you can go for polytechnic diploma or ITI diploma, you can't pursue both courses at the same time. So make your decision wisely and then go for it completely.
I hope this helps you out. If there is anything else that I can help you with then please let me know.Till, then all the very best and stay home and stay safe.