[Koha] koha-circulation policies and patron restricions

Hello, We have only one kind of patron's (student's) database with the library, and depends on the collection/library ( from general stack, SC book bank) patrons will be having restrictions to number of books to be borrowed and also the due -date attached to it. Our scenario is: eg: General category student can take only 1 book from General Stack and due date is for 15 days and not from any other stack. where as, SC category student can take 2 books from SC book bank for 3 months and also 1 book from General stack for 15 days. How to restrict patrons from checking out books from particular collection? How to achieve this? Thank you in Advance Satish --