Dont even think for giving the amcat exam their exam fees is aroung 800 to 1000 and after you will give your exam they will provide you your result and after that no companies will try to contact you. I am telling you from my personal experince as I have given their exam and I did score good marks also.
Main motive for people giving amcat exam is that they will get a suitable jobs in their fields but they are not providing you the opportunity to give the interviews because when you will apply in any company through amcat then you will not be getting any reply from them. So it will be a waste of money