which exam one should passed to be sub-broker

hi all of you
i want to know abot the sub- broker ship, which exam should i paased to become sub broker? i want to do in CASH , F&O , comodity . i red the different opinion about the NCFM exam for the sub broker but i didn't get exatly which is required ?
1)one more think how these exam are?
2)what is difficulty level?
3)how one should prepared for it?
4)is the MODEL TEST provided by the NSE are sufficient ?

Hi,
ncfm cash and derivatives are enough to become sub-broker.

thanks for your quick reply.:thumb:
but i want to konw more detail about it, i hope you will share it to me.
1) what is difficlty level of such exam?:

2) how one should prepared for it?

3)is there is any source to get the model test paper for it other than NSE?

4)the model test paper given by NSE are sufficient?: