I want to give cat exam in 2019 and I am late for taking admission in any institute how l prepare for it at home what material should I take

It is better to join any institute right now also as Cat examination has almost 4 months left . They can provide you with better tricks to solve big problems , also they can give you the tips about how to answer the questions smartly . You can also join a crash course for Cat . At home it will be little difficult,  if you want to study at home then firstly have an habit of reading big articles , read newspapers as it will give you ability to read paragraphs in exam . Buy best books , and solve hundreds of questions,  join online cat tutorials , buy notes from a friend who goes to classes  , ask a friend who has give the exam earlier as they can give you an advice for the exam .

Overall i suggest you to join a crash course , as it will be better for you only or join an online classes or join a proper institution as still there are 4 months left for the exam, you can still crack it.