There is nothing to think about the categories you think in your mind. ISC has covered almost all the categories that are required to perform at ISC. If you have anything in your mind, please open up and put it here.
Please dive deep into the sea of ISC and find the various pearl like categories available at ISC. And you can get silver, gold, diamond and platinum from ISC sea.
No life without Sun
"Do not give up, things might not favour you always"