First, you should make sure that you have what it takes to make it in the film industry. Joining FTII doesn’t guarantee a job. It doesn’t offer placement. So, you will have to seek job opportunities on your own. However, the alumni base is quite helpful. 

At the entrance, there will be questions mostly from GK, Film History, Logical Aptitude, and design/writing/creative questions. Read up on Indian Film History. Read about the different ages and the people that made a mark on Indian Cinema. Even if you are not that interested in regional cinema, it’s important to know about them. At the entrance, they can ask about different parts of the history of Indian Cinema. You may also need to write your opinion. Also, watch a lot of films. Try to analyze them. Try to shoot a film, if you can. It will go a long way if you get through to the interview stage. 

You can easily find the previous year’s question papers of FTII.