Recently ive noticed the car over revving ( )

Its a mk5 facelift 1995 escort 1.6 16V

And I pull away in 1st, into second and into third..

Im in third & I put the boot down a good bit & the car seems to rev more than pull

My mate said to "test" the clutch.. I should park with handbrake on & select 1st & let the clutch go beyond the biting point. I did so & it was pulling the car & eventually stalled!

Ideas?