Bernie talks excessively and frequently interrupts students. he seems to fidget constantly. his teacher has a very difficult time keeping bernie in his seat and he has a difficult time waiting for his turn when playing games. it is most likely that bernie has

It is most likely that Bernie has Predominantly hyperactive-impulsive ADHD

Explanation:

people with predominantly hyperactive-impulsive ADHD tend to fidget and squirm a lot. they have a hard time staying in one position. they are more likely to interrupt people and talk at inappropriate times. moreover, they find it hard to wait for their turn and they don't listen to instructions easily

i honestly speaking this is too long