Hi Abhijeet,

BA or Bachelor of Arts is three year full time graduation course divided into six semesters. There are 5 subjects in which two are compulsory and other 3 you have to select yourself according to your Interest

As you know you're bit late to apply for many goverment  colleges. But  don't worry you can enter into some private colleges in local areas. There are many private colleges in delhi, noida, lucknow which can give you admission in BA like Amity Noida. You can even go for the DU SOL which provides you distance learning education if you want to.

Hope it helps:)