u/Accurate-Tell-3404

I have started my n5 journey 2 months ago and my exam is in july.I have no issues in vocabulary or grammer but kanji just irritates me. I have started studying and realised the on and kun sounds have a thumbrule but they dont follow it for some reason? and how can i learn it clearly i know wanikani and everything but i am not clear enough on how do i proceed.Please do help me out

Edit:- its not the kanji recognising i have issues with,it is the pronounciation of that kanji