confusing

ps; im intend to be a diplomat and i oledi checkt it out what its about . im goin to enter form 4 and what should i have for my subject . sastera ? sains stream ? whenever i checked , it stated that kena amik form six ! then kena ambil sastera . yang satera tk kesah lah , its all about entering form six tu . i dont want to spend whole my life dkt skolah ! its that has another way ?