Check this out. It gives clear directions to reach the university. https://manipal.edu/mu/admission/international-students/how-to-reach-manipal.html

However directions will be dependent upon the mode of transport you take. Check indian rail website for the information on the trains you have to take. https://indiarailinfo.com/search/adi-ahmedabad-junction-to-ud-udupi/60/0/1245 -  this gives some information. check it out too