If you want to get admission to better colleges, achieve scholarships, and select good tough subjects for the future, marks do matter. But they are only limited to colleges. Hundreds of degree holders with good percentages and GPAs are sitting at home unemployed while the backbenchers are found becoming equally successful. Therefore, marks only matter while you are studying in schools and colleges but not in business. Yes, they also work in Public Service Commission tests (Lok Sewa). But if you want to do business, practical knowledge is more important.