Hi Harshit, I am a CA Final Student and when I was studying PCC, even I was scared of Costing and FM. I failed the first two attempts, getting very low scores in them. For the third attempt, I followed Paduka material, and was able to crack to it. Which material are you following? Padhuka is better, important points and formulae are given in the first few pages and you have to be thorough with them. And also practice is the key, Please go through atleast past 3 RTPs, and new MTPs and Practice Manual also, Hopefully you will make it, PS- If I passed Costing and FM, anybody can..!
