The paper tests your creative aptitude, visualisation skill, reasoning, creative writing, awareness, general awareness, general knowledge, some basics and sensitivity to solve any design related problems, etc. Agreed that people from B.Des will have a slightly better advantage but you can crack it easily too. So you will have to dig as many as sample papers as you possibly can and practise them. There is no set syllabus in specific for this test. And so you have to either join a Coaching center for getting a hang of the subject before you appear for the entrance exam or you will have to practise as many as sample papers as you can and read B.Des books.