You haven't mentioned the course you have appiled in NIFT - BFTech or BDes. But the most crucial purpose of the test is to measure your creative and imaginative skills. So try to improve your drawing skills as well as your creativity. If you are not speedy enough, these will be useless. Solve previous year papers by your own. Keep yourself aware about current happenings. Prepare general knowledge from books and newspaper. Spend time on reading fashion & design books/magazines. You should think out of the box in order to secure a good score.
Download various sample papers from- http://design.careers360.com/download/nift-entrance-exam-sample-papers-previous-years?icn=NIFT_Entrance_Exam_sample_paper&ici=NIFT_Entrance_Exam_article_contmap
The creative ability test in NIFT Entrance exam is conducted to test your Observation power, Discernment ability, Design ability and creativity in thought development. This is given more weightage than any other parts of the exam. Creative ability test is nothing but picturised manner of any incident, you can be asked to paint the room that you can see from top, express emotions through colours, any product, or illustrate any incident etc. The best way to know about Creative ability test is YouTube. You can check YouTube videos to gather ideas. But it is always advisable not to copy anything, cause you must be creative and imaginative in order to clear the test. Books like Arihant NIFT Entrance Exam Self Study Guide, NIFT Exam Guide by Verma etc you can follow to prepare for the Exam. Go through previous years' question papers so that you can get idea about which type of questions are asked. Try to solve these papers by your own.
General ability test will check your Quantitative ability, analytical ability, communication skills, general knowledge and current affairs.
Situation test carries 20% weightage in final rank list. It tests candidates material handling and innovative abilty on a given situation and given set of materials. Practice handling all types of craft materials. Focus on making shape with paper, clay, fabrics, card board etc. Situation test literally tests your imagination and practicality as well.
You need to practice construction quickly as time given will be limited.
You can go through the article given below so that you can get an idea for the situation test.

http://design.careers360.com/articles/how-crack-nift-situation-test

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