I see what you mean but I just think based on what I've seen on the characters mentioned, they all seem to be head strong, very skilled and front runners (Bolt & Sarada especially) so we'll see.
It would probably be dependent on what is actually happening then.
For example the exams are going to be like Part 1 but different. There is a test of intelligence, team work, and then the final examinations.
Sarada strikes me as someone who excels in her studies, who loves team work, and she should be fine over all.
Mitsuki also strikes me as someone who is either moderate or above average in intelligence, should be okay in team work, and the final exmaninations should be good.
Boruto strikes me as someone who doesn't apply himself but is smart, now I don't think Kishimoto made him stupid at all ... in fact I don't think anyone in this team is holding down anyone, that goes in every category. I wouldn't be surprised if he a silent genius, sort of being able to answer the questions properply but not wanting to/doesn't care to. We'll see.
I know for a fact he might be bad in team work, considering his personality is extremely vigorous and self confident. He probably thinks he can do it all himself without the need of team work, remind you of anyone?
As for the final examination, he should make to the end (as obvious; Shikamaru vs Boruto). Sad part is he won't be able to finish because the villains attack.
Forever a Genin like his pops and master.