If it is a small scratch, the teacher should give first aid. Every shop should be equiped with a first aid kit in case of cuts or burns. It is the teacher's obligation to keep safety devices in good condition on all machines. Make sure the guards fit and are on all the machines. Turn off machine when making any adjustments.
Every shop needs some type of ventilation.
Our shop has a 2x3 vent fan. The finishing room also has one. Class Room Learning is made much easier when there are not so many distractions to the students. I prefer a seperate classroom. This provides a cleaner and more accepted place to have tests and written work.