Suppose that I apply and am not admitted. May I ask you to reconsider me next year? Do I have to repay the application fee?

If you are reapplying for the next academic year you must submit all new application forms, including the application fee. We do not use materials from a prior application. The one exception is letters of recommendation. As noted on their Admissions Supporting Material page, the Graduate School of Arts and Sciences allows re-applicants to reuse letters from an application in the prior year.