What is the procedure and criteria to apply for c2 grade with 5 yrs of experience

Bro, just forget about c2 grade with only 5 yrs of experience. It's like asking for a unicorn 🦄. You need at least 8-10 yrs of solid work, plus some serious networking and buttering up the higher-ups. Focus on gaining more exp and skills, then maybe you'll get there.