Hello Aspirant,

The previous year papers of medical entrance exams are available. But the years for which you want are unavailable as a PDF or at a website.

You should check this link to get pervious 10 year papers: https://medicine.careers360.com/articles/neet-question-paper

For papers from 1987 you should buy books of previous 33 years like MTG 33 YEARS or OSWAL 33 YEARS which are available on different websites online.

HOPE THIS HELPS