i had not made the generation code of AIIMS 2020 what should I do next

Stephy, if this is for AIIMS PG or AIIMS B.Sc, if you haven't generated the RUC code, unfortunately, you will have to wait until the next session. Because AIIMS hasn't extended the date for RUC code generation. But if it is for AIIMS MBBS, from this year admission to AIIMS is through NEET score and so you needn't fill any application form or generate any RUC code.