Help (time for studies)

hello friendz . Please help me as I m studying by myself and I've started preparing for ipcc both groups some days ago now I m giving around 8-10 hours for studying.right now m studying accountancy by Tulsian's book and I've done first 2 chapters(company final a/c,Cash flow) till now. now the problem is it's taking too much time . According to the article IPCC Study Schedule for Preparations by sir Bhavin Pathak It should take around 2.5 H and 4 H respectly for those chapters a total of 6.5 Hours but for me it took around 10 Hours and 16 hours for them a total of 26 hours. what I m doing is reading each and every line but not more than once unless it is highlighted .up untill now I've been able to understand everything but the only problem is it's taking too much time. So guyz please tell me if there is anything that I m doing wrong or anything that I m not doing or any suggestions please comment on this. Thanks