Hello Vipul Bhandari, you can't get Google Adsense account by just posting question papers in ISC. To get Adsense account you need to meet atleast 5 out of the 6 requirements:
1. Your Profile should be updated with Address.
2. You should have Minimum 10 articles approved:
3. You have to achieve GOLD Level.
4. You have to Receive atleast 1 prize.
5. You have to be active in ISC for 6 months.
6. Your Profile photo should be uploaded and verified.
If you satisfy any 5 of these 6 requirements you will be eligible to apply for Adsense account and can apply for it.
To check whether you meet these requirements or not, go to your dashboard and then under revenue settings, open Adsense profile page.