ZCO - which editor to use?

Hi, I am preparing for ZCO in C++ but I am not able to decide which editor to practice with so that I don’t have any issues during the test.
I use CLion with Vim emulation on a daily basis but not sure if the vim emulation will be provided during the test because I remember reading somewhere that CLIon is provided. I am ok with normal vim too if that is provided.
Or vim/vim emulation is not provided in any form?

Thanks in advance!