Well I think it helps quite a lot if you attend a prestigious school or university ,

It means that the students there are of a high level of education.So when you look for a job later, you need to write and present your CV . Employers have a high opinion of people coming from prestigious universities. Moreover when you attend a famous university , generally speaking you meet and work with students of a high social background and that helps because their parents or relatives may help you find a good job in thr future!