Prediabetic and diabetic are a continuum. Going by hba1c truly normal is less than 5.0, 5.7 or so wool get you diagnosed as Prediabetic, 6.5 or so diabetic - depending on the lab ranges.
Fasting < 95 normal, 95 - 124 Prediabetic, 125 + diabetic.
2 hour post eating should be < 120 to be normal.
Hope this helps.