Easy or difficult paper, the pass rate is around 50%. So just do your best you can pass. Optional papers the pass rate is around 30%. That is more difficult.
I passed very comfortably first time. I worked sporadically for around 8 weeks (including a 10 day honeymoon). Towards the last 2 weeks, I worked like hell, although I procrastinated A LOT
I don’t think the work I did deserved the mark I got (I did much better than expected).