I would suggest you to prepare a time table as per your convenience, Here are some preparation tips to prepare NIFT Entrance Exam, You can follow to crack the Exam.

Upgrade Observation & Visualisation Skills:The most crucial purpose of the test is to gauge your creative and imaginative skills. Apart from that, the questions are framed in order to judge your general awareness, observation skills and visualization as well. So, working on developing these skills is very important.  

Improve Speed:Having exceptional drawing skills and creativity are useless if you don’t have speed. The whole idea is to be able to present your imagination and uniqueness in a limited time.

Solve Sample Papers:It is recommended that you practice sample papers as much as you can. This will give you an idea about the types of questions that will be asked. 

General Awareness: Awareness about current happenings is very important.You should also know about the famous designers, who have contributed in this challenging field. Spend time on reading fashion and design books/magazines.

Be Innovative: You should have the ability to come up with unique ideas to design something new. CAT and GAT will evaluate your unique way of thinking.

Good Luck!