Ayushi as MU-OET is an online test so it is very hard to find out the old papers and get a record of questions from last year papers until and unless Manipal itself releases the paper which you have already checked on the website and there are no mock papers available. 

I am sharing few of the links with you where you can get a few mock papers for MU-OET test and even some of the very old papers of this exam. You can go through these papers and solving them will definitely help you in improving yourself:

• https://blog.oureducation.in/manipal-online-test-sample-paper/
• https://www.askiitians.com/past-year-papers/manipal-uget.aspx
• http://www.entranceindia.com/manipal-engineering-entrance-previous-exam-papers-practice/
• https://examupdates.in/mu-oet-question-papers/
• https://manipal.testbag.com/
• https://www.prep.youth4work.com/College-Entrance-Examination/Manipal-University-Online-Entrance-_Test_-MUOET-Test
• https://www.shiksha.com/university/manipal-academy-of-higher-education-manipal/exams/mu-oet/question-papers

Feel free to ask if you have any more queries. All the best!!