my pcm marks is 247 and cet 71 what may be my rank
First and foremost of all, please mention your category, state of origin, etc. The rank is not determined on the basis of marks solely. The cutoff ranks are calculated after taking into account many factors such as state of domicile, category, gender, and many other things to calculate a appropriate ranks. You would find many websites that report cutoffs in ranks but not in marks. That is because they can't. It is based on a normalization formula. Yet what I can assure you is that you have done pretty good and it should not be much difficult to get an admit. Wait for the result though!