Nothing thats down on paper but....
What you find is that ppl pilots fall into 3 groups.
1. Good hand eye and solo quite quickly.
2. Methodical and think and can take long periods of repetative work cycles.
3. Can do both.
The 1st group go solo quickly but struggle with the nav.
2nd take a bit longer going solo but have zero issues with NAV
3rd are what the potential commercial pilots should be in.