Looks like a good start i was in your position a couple of years ago. Another thing to check into is most of the "pro" tools (mac snap on matco) offer a vo-tech discount. I'm not suggesting going overboard with that but what I did if I needed a particular tool, I tried to buy it from one of the above 3.
A couple of suggested additions.
These don't look like much but are great for lining up the holes in covers
This set of prybars or atleast one of this type.
You will find so many uses for these, from yanking electronic injectors to pulling out seals.
Good luck to you. You won't regret it. And don't limit yourself to just trucks work on anything you can get your hands on at school. I started in diesel, ended up in stand by generators. But one thing is for sure my toolbox collection has grown considerably since school.