Hi, we cannot predict the minimum score this year as the pattern of the exam has been changed completely this year. Earlier there was no negative marking and +1 marks were awarded for each correct answer whereas this year there was a negative marking of -1 for each wrong answer. So I would suggest you to wait for the official announcement of the result. The result is expected to be announced by the first week of May. If you want any other information about the Manipal entrance test you can check out the following link-
https://engineering.careers360.com/articles/met
All the best!