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https://www.gp3series.com/Guide-to/The-Series2/

Race two grid explained

The first eight finishers in race one will start race two in reverse order, cars finishing in 9th position and downwards will start in their finishing position.

By way of illustration:

Race one / Race two
DriverΆs Finishing Position / DriverΆs Starting Position
1st / 8th
2nd / 7th
3rd / 6th
4th / 5th
5th / 4th
6th / 3rd
7th / 2nd
8th / 1st
9th / 9th and so on

If there is a dead heat in race one, priority will be given to the driver with the most points in the drivers' championship.