How I prepare for ip cet B. com hons entrance exam for 2020 . plz also tell me some online app Or site so I prepare at home??

Make a proper study schedule at home and go through the entire syllabus. You can start for those chapters which contains high marks and little tough for you if you have enough time ,other wise go for easy chapters. Make your own notes even if you have taken coaching classes . Try to cover your syllabus early so that you get enough time for your practice. Must make strong command in Accounts and business maths because these subjects will help you to score more. Try to solve previous year exam papers without taking any help. You can study   GGSIPU BCom Hons Guide with your +2 books. You can go through some well known YouTube channels like BW Campus, Higher Education, My Commerce Info etc.