Help on grammar

[History teacher]

Dear teachers,
Prepositions are one of the biggest problems in my quest to improve my English. I need some help to see whether my sentences are fine grammatically. Your help is appreciated.
My sentences are as follows :-
Students who did not achieve the minimum requirements of 75 percent attendance will be barred from sitting for the final examination.
My doubts are as follows :
1. Can I delete the preposition " for " ( barred from sitting "for" the final examination?
2. Is it correct to use " barred from" to refer to banning students from the examination ?

[Casiopea]

"from" is correct. But, "barred" is a tad out of context. Why not try something like, "... will not be permitted or allowed to write the final exam."

Welcome, teach.

All the best.