PFP Ns deferment doubt

Im taking pfp year 0 right now and got my ns letter to apply for deferment. I went into the website and it told me my pfp course ends on 2027 March but I want to finish my poly education before going ns. There was a button where it asked me if the info of the course ending date was correct if I click no it asked me if I wanna do full time studies. I did click yes for that then it asked me what course im taking and when it started and when it will end. But im pfp I can only select my course next year and then I will know when my course will end. Idk im just confused I wanna finish my poly before going ns. Can anyone who has been in pfp before help me.