Hey Nishant!
If you get a seat in college hostel , then it will not cost more than 7000 month per year. And getting a seat in hostel is on the basis of your score in 12 , and nothing can be said about this . And if talking about pgs ,then it is hard to find pgs within Rs.7000 but it is not impossible to get. If you will try hard to find them , then you can definitely find one.Since you are a boy , the chances of getting it are more because generally the cost of pgs for boys is less than that of girls.
Hope it helps!