First of all, P1 course is no longer offered in Tracher Training colleges.
Diploma in primary education is the new minimum qualification for primary teaching.
The entry grades are:
A minimum of C plain in KCSE.
A minimum of C plain in Maths, English, Kiswahili
A minimum of C plain in either Physics, Chemistry or Biology
A minimum of C plain in one humanity subjects e.g History, CRE, IRE.