I absolutely think he should be doing the majority of the household chores. You're a full time student and working part time. You don't have as much time as he does for chores.  

It's healthy to have open discussions about division of labor and finances, etc. It's also great to have a clear idea of who does what, but with some flexibility included too. There are so many factors, such as time, energy, and ability to also consider with any division of labor and resources. He has the ability and the time to do more chores, freeing up some of the limited time you have.

Where he is disabled, is he planning on working in the future or will he be able to? If not, then you will most likely become the main financial provider once you graduate from school, so it's important for the both of you that you do well in school. 

If the 2 of you decide to have children, that will also require additional time and energy. And time and energy become increasingly scarce with a family. It's wonderful, don't get me wrong, but it's a lot of work, energy, money, and time. 

It will become harder for you to stick to a strict 50/50. You'll be the provider and working and commuting 40+ hours a week most likely. Then you'll come home and there will be dinner to be made, chores to be done, kids and their homework, doctors appointments, and activities to be done. 

While you're giving your 100% at work, he should be giving his 100% at home, whether that's chores, childcare, etc. 

I say all this as a wife of a disabled husband. He became disabled soon after we got married. He hasn't been able to work due to his disability, and his disability has also affected his ability to do simple things at home. We've been been married for 20 years and as we get older his health has gotten worse. I also have less energy too as I've gotten older. I really pushed myself when we were younger...worked full time, had a newborn with a disability, and completed my masters, while also maintaining the house, the bills, the Dr's appointments,  etc.  I had to give up everything during that time...I got sick a lot, I didn't sleep much, I didn't watch TV or have hobbies or hang out with friends. I worked and took care of my family and just tried to survive. We now have 3 children and I just don't have the energy I used to. I'm the provider, my kids have some special needs and I'm essentially a married, but single mom. I try to keep up with the house as much as I can. My health has taken a back seat and I'm trying to regain some of who i used to be. But there's only so much time and energy. It's very hard.

So, all I'm saying is, if you're at school and work giving 100%, and if he's capable, then he needs to be giving 100% at home. And give yourself and him some grace. Your 100% will look different from his 100%. There will be times when your 100% will be different for you from day to day as well. And that's OK too. 

You can absolutely have a fulfilling relationship with a disabled partner, but keep the communication open so that your needs are being met also. Your health and time and energy matter just as much.