Rejected student pass

Hi ..me and wife ep holder...my wife ep holder 13 years...and me just 5 month...currently we stay in pasir panjang singapore..my kids study for aeis preparatory class used social pass and stay together with us.. we has apply for student pass...but 2 times rejected...my kids 8 and 9 years...any idea ...what i need to do....im frusted and speexhless...we dont know what to do

I assume this "preparatory class" is not recognised as full-time study by the Singapore authorities, therefore you cannot get a student pass for them.
I recommend you get a DP (Dependent Pass) for them instead. If that also fails (e.g. because you don't fulfill the minimum income requirement), they must move to another country.