I am a class 10 cbse student.I have missed my preboard due to some medical cause but according to my school that cbse has made preboards compulsory this year and only those students who will attend and pass the examination only they will be provided with the admit card. Please clear this fact.
Yes, it is mandatory that students give pre-boards before CBSE as some schools say, however it is mandatory to send the notes to the board. Most schools prefer these pre-tables to test whether the student is ready for the board exam or not.
So if your school wish to take pre-boards then you have to give it and on their permission only you will get the hall tickets so contact them and see if there are some provisions out there.
I hope this answer helps. All the very best for your future endeavors!