Angel, the previous year and model papers of MP Board are necessary to understand the exam pattern and types of questions asked in order to structure the preparation schedule or areas which are necessary to work upon. Here I am sharing a link where you can get all the Model Papers of MPBSE Class 12th examinations, so that you can practice them and improve your chances of scoring good marks

https://school.careers360.com/articles/mp-board-12th-model-paper-1/amp