Salim, it depends on when is the supplementary exam due to clear your Backlog. Technically, you should have passed in all subjects atleast at the time of admission or else your seat stands cancelled. But if you have already appeared for the backlog and then you are awaiting the results, then you can appear for counselling by producing a valid proof of document until the pre final semester that you fulfil all the eligibility criteria until pre final semseter.