What is the pass marks for MEC group in intermediate?

There's no single "pass mark" for the MEC (Mathematics, Economics, Commerce) group in intermediate examinations. The passing percentage varies depending on the education board and the specific year. Each board (like the Andhra Pradesh Board, Telangana Board, etc. in India, for example) sets its own minimum passing percentage. You need to check with the specific intermediate education board in your region to find their current passing criteria.