Every students need to appear in both theory final examination as well as practical final examination. I dont know about your board but I am telling this thing based on common rules.
If some one got fail in practical he need to give practical exam again. This is same for absent students.
Every students need to pass both theory and practical examination.
But in some private schools they can take your practical exam again. As this is your school schedule not the board schedule. Means this date is given by school not by board.
So dont worry.