His shop instructors will likely give him a list of hand tools he needs for shop. When I was in a voc. electrical program, they loaned us a tool belt with what we needed for year one in school and the expectation was we would buy our own by sophomore year.
For apprentice work good Klein brand hand tools should do. The guy he's working for will have the other stuff. Saws, drills, fish tape, pipe benders all kinda stuff.
9" linesmans pliers
diagonal cutting pliers
good tape measure (when I was in school we were using a 6' folding ruler and found it VERY useful)
slotted screwdrivers in 3 or so sizes
"wiggy" voltage tester
good electricians folding knife with a hooked blade
good tool belt to hold it all, one made for an electrician, not a carpenters belt
I think Home Depot is selling Klein tools now but you will find everything you need for sure at an electrical supply house. (let them know what you are buying them for and ask if they can give you a discount)
I finished an Electrical program and it was the best thing I ever did. My career choice was very different and I never worked as an electrician. I did learn much more than wiring in school however. They will teach your son all kinds of great skills and work ethic. He will learn enough carpentry, plumbing and metal working skills to fix anything.
I have never paid anyone to do anything for me. I do my own carpentry, wiring, plumbing, roofing, auto repairs, oil burner work, work safely in the air, welding, cutting. Fix anything. Build anything. Really, all due to what I was taught in school.
It's been a long time, I am sure some guys who work in the field now will have many other ideas too.