medical test in infos

Sir i read the physical conditions for indian forest service in which medical test after interview .in medical test there ia check up of flat foot.so sir i am not clear about the flat foot problem ,for which service am i eligible,am i eligible for ifos or this is problem and upto which extent they allowed(i had flexible flat foot)sir please guide me and if you know any who clears ifos and can guide me about medical tests so please give me thier mail