Hi Sergey,

My name is Jim Mitchell, and I'm a Success Community Manager for the Salesforce Certification Study Group. For all of the details you'll need to get started, take a few minutes to read our Group Policy and Rules at https://success.salesforce.com/06930000004lAqg.

If you have any questions that aren't answered there, don't hesitate to post them to the group feed. There are lots of members who'll be glad to help you out. On behalf of the other study group leaders, welcome to the group!