Shino said that it was a test for overall physical assessment for your strengths and weakness. Based on that alone, it means Boruto and Iwabe are superior to Sarada, and Sarada (and those two) for everyone below them. I don't remember who was fourth, I think it was Shikadai or Inojin.
Mitsuki never took the test, but I would rank him above Iwabee, Boruto, and Sarada. Making the rankings:
1. Mitsuki
2. Iwabee
3. Boruto
4. Sarada
Although I wouldn't be surprised if Boruto/Sarada surpass Iwabee by the end of the year, but potential wise, even the teachers stated in the latest episode that Boruto and Iwabee are the most interesting of the year (this was a conversation between Konohamaru, Moegi, and Shino).
The rookie the year is definitely gonna be either Boruto, or Iwabee. But I wouldn't be surprised if it's Mitsuki, because he's clearly superior.