If he is crying in the 2yo class why do you expect the 3yo class to be different?
My son had a hard time adjusting to PreK at age 2.5-3 so we pulled him out and tried again at 4. Giving my son a little extra time to mature really made HUGE a difference. Now he loves preschool, whereas a year ago he was melting down in the parking lot and crying his way through the day.
Ofcourse if you have to work, you may not have the option, but bear in mind that the older class may be less tolerant of crying and meltdowns. Good luck I know its hard!
