For Exp, JExp, Drop
Script: <"
bonus2 bExpAddRace,RC_All,100; // Increase Exp Rate 1x
bonus2 bJExpAddRace,RC_All,100; // Increase Exp Rate 1x
">
OnEquipScript: <" sc_start SC_CASH_RECEIVEITEM,-1,100; "> // Start drop rate "-1 Infinite" 1x
OnUnequipScript: <" sc_end SC_CASH_RECEIVEITEM; "> //Stop drop rate
So as for your needs
Script: <"
bonus2 bExpAddRace,RC_All,15; // Increase Exp Rate 15%
">
OnEquipScript: <" sc_start SC_CASH_RECEIVEITEM,-1,15; "> // Start drop rate "-1 Infinite" 15%
OnUnequipScript: <" sc_end SC_CASH_RECEIVEITEM; "> //Stop drop rate