How to remove cork tiles might depend on how well anchored they are.
It might be possible to strip them using an ordinary DTA 150mm Heavy Duty Floor Scraper in combination with QEP 4" Floor And Wall Razor Scraper.
However, if the tile glue has petrified and it is now as hard as rock, I recommend hiring a Floor Stripper from our partners Coates Hire. The machines can be hired for 24 hours of five days. Contact your local store to check availability.
Another alternative would be to place the job on a service like Hipages or Airtasker for a professional or handyperson to complete. - EricL
