Hey Ajay ,
Greetings!

You can never find MUOET previous exams papers as it's a online exam. Many books have previous MIT papers which are all fake.
I would suggest you to solve all the easy level problems ya formula based problems. MUOET mainly tests your speed . You have 200 questions to answer in 150 minutes.So basically you need to answer every question in 45 seconds. During my days I mainly concentrated on NCERT books which is more than enough .
Just for practice you can also solve from arihanth series.

Source : https://www.quora.com/Where-can-I-find-some-of-MU-OETs-manipal-university-entrance-exam-previous-year-question-papers

Good Luck ! You can reply to this comment if you have any further queries , I will be happy to help .