Certificate of practice while in employment

I am a chartered accountant and currently working in an MNC.

I applied for full time COP immediately after completing CA final.

But i was not able to cope up with high corruption in my place.

So i quit practicing and joined an mnc.

One of my friend informed me that COP need not be surrendered.

Is it so?

A practicing CA is required to comply with certain requirements such as minimum of 20 hours training.

Am i required to comply with such training?

What are the options available for me?