Driver must secure 40 Points in the last 3 seasons
2018: Indy Lights: 1st -> 15 points
2017: IMSA Prototype: 1st -> 18 points
2016: Formula 4: 3rd -> 12 points
2016: Pro Mazda: 2nd -> 10 points
You have probably read about it elsewhere already.
2018 Indy Lights doesn't qualify for full points.
Only one of the 2016-ones can count.
IMSA Prototype is likely meant for Dpi/LMP2, not the PC-class. If it also goes for PC-class for some weird reason - there was just 3 cars doing the season. So that's not full points at all.