first time for you to sit in my class

[Dr.Appalayya]

I saw a new face which did not ever turn up though 25 sessions had already been over, and asked him:

Is it first time for you to sit in my class?

Is the above sentence correct? Is there a better way of asking it?

 

[sudexpress]

Suggestion:

Is it the first time you come to my class?
Is it the first time you are attending my/this lesson?

 

[the_del_star]

Is this the first time you have come to my class?

If you want to sound snappy put emphasis on the "first time"/"whole semester" :
Is this the first time that you've attended my class the whole semester?