boss, u cant do much about the cooling however follwoing steps can make it better:
tint ur window glasses
Take out ur roof inner lining and install namda or any heat resistant material and then install back
get all your door seals checked if they are taking outside wind & temp in ur car compartment
get ur dashboard covered with some thick cloth so ac air vents will remain cooler
get ur car firewall checked and concealed, maybe it is transferring heat from engine rooms to car compartment