Thats a good judgment and you are pretty clever. Lot of the students don't even give a second thought about the management of finances before they come to US. Its hard to make 4K from on campus job cause you will be new to the campus and your chances for a while will be limited than the students you are talking with. I would say, put $2500 from on-campus job and you can increase the summer earnings to at least 4K if you will work in Nepali fashion (summer ma mile samma off campus cash ma kaam garnu. u will get more hrs).