NMMS 2019 paper has been officially released by DGE Pondicherry. Official answer keys where also released and I'll provide them to you in the link below. Solving these previous years papers and other sample papers ie mock tests will help you a lot in knowing about the paper patyern in detail and prepare you in a more efficient better way. You'll also learn time management skills.
The link to the previous year papers is given below...
Best wishes. Thank you .