novice to esxi server certification

Dear Sir,

I'm novice to esxi server certificaiton. I saw there are two categories of test: Dual Host & Single Host.

Could you advise me the order to do server certifiaciton?

1. For example, to do all tests in "Single Host" first, then to do all tests in "Dual Host"?

2. Should I create a "cluster" in vCenter to add primary host and second host inside to enable shared storage prior to running esxi server certification test? If so, after creating shared storage, should I remove hosts from the cluster before I start the test?

Thanks.

Regards,

Osito