Which Olympiad should I register for in 2018?

If born in 2002, currently in 5th year IrEUSO
If born in 2002, currently in TY IrEUSO
If born in 2003, currently in 5th year IrJSO or IrEUSO
If born in 2003, currently in TY IrJSO → Next year will be invited to Selection Round for IrEUSO 2019-2020