Non-Jupus / jupus

My son will going to grade 10, he will take Phy, Chem and M2. He actually want to take Bio because he want to be a Chiropractor. But he is a SEN student, so I don't want him take Bio, it may too hard for him in spelling and writing.
This year, his school offers around 20 students to take A-level course together with DSE on the coming Oct. He is one of the 20. Teacher explains if we take school offer,