There are a couple problems with the Canon A-1 (AE-1 and AE-1 Program, too) that your son might find limiting or frustrating as a film student.
He will most likely be required to shoot in manual metering mode. There is no coupling for the meter with the lens aperture on these cameras. The display will indicate the "proper" aperture, but as the aperture ring is turned, there is no feedback in the viewfinder. This requires the photographer to visually check the aperture setting on the lens.
The other problem I had with A-series Canons was their centerweighted metering pattern. They would frequently underexpose images if any light source was in the frame, or in high-contrast situations. I grew to hate that metering pattern. True, once one understands how it works, one can make allowances for this. But I still find it to be an inferior metering pattern.
I highly recommend either the original F-1, as others here have, or a good old workhorse that's almost as capable -- the FTb. Both cameras have match-needle metering in which one needle is coupled to the lens aperture, the other to the shutter speed selection. One can properly determine exposure without having to take ones eye away from the viewfinder. The other nice thing to me about these cameras is the way they meter. Metering occurs only within a small rectangle visible in the viewfinder, approximating 12% or so of the image. I found that judicious placement of this rectangle, even in high-contrast situations, allowed me to meter a scene accurately. My incorrectly exposed images dropped almost to zero when I switched from the hi-tech A-1 to the low tech FTb (and soon after the F-1). The quality of my images improved dramatically as well and my A-series cameras were relegated to the shelf soon after.
Another big plus to me about the original F-1 (but not the New F-1) and the FTb is they both have mirror lock-up. Very useful for macro or long telephoto work.
Best,
Michael