AMUEEE is the exam conducted by university for admission in B.tech and B.arch. I hope you are talking about B.tech.

First of all , you should understand the exam pattern. Then refer to official site for sylllabus. 

After doing this, make a study plan for the your preparations. Now decide the areas where you need  to work and areas that will fetch you good score. Now the next thing is the study material, get the study material form the internet and refer some good books, plenty books are available in the market. Prepare your time table and stick to it. Try solving previous years papers in the prescribed time, that will help you manage time in exam. 

As far as paper is concerned, it will be objective paper having 150 marks and the duration will be 180 minutes.  The plus point is that, there will be no negative marking. Read the question paper first , don't waste much time. Try to attempt those questions only for which you the answer. Manage your time in such a way that you are to able complete before 15 minutes. In the last 15 minutes attempt those remaining questions also which you don't know. May be they will fetch you some marks and that will the bonus. 

Best of Luck!!