Children who have executive functioning disorder, attention issues, autism spectrum disorder, or other learning disabilities are often resistant to change. I believe this is likely because when things are orderly and predictable, they are more likely to function well. When things occur randomly, they are required to make decisions quickly and figure out how to respond to a new situation. These children need routine; unfortunately, every classroom is different and teachers frequently change the daily routine in order to keep their classroom interesting and challenging. Children with learning issues need additional support to do well when things are different from what they expect.
Several things may help these kids.
Providing advanced warning or a buddy to help children who resist changes to their routine can be very helpful. Eventually, these changes may not be so difficult because these children tend to get better at handling them as they grow older. If your child has an Individual Education Plan (IEP) or a 504 Plan, consider asking for help as part of their plan.
You can learn more about ADHD by reading Managing Middle School With ADHD.
For information on executive functioning read Executive Functioning: How It Affects a Student In School.
If your child is autistic, you might want to read Help Your Autistic Child Succeed in School.