what is the last date of submission of developer certification by smart bridge?

Hi,  

Superbadges can be tough, but you’ve got this!   

Trailblazer Community members can’t give you specific instructions on how to complete a Superbadge.  

Superbadges are credentials and sharing content or getting help clearing specific checks is against the Salesforce Credential and Certification Program Code of Conduct.  

You can check out the Superbadges and the Salesforce Credentialing Program module on Trailhead for more information on our security policies.  

You can also use the Superbadge Challenge Help article, which gives tips for completing Superbadges and contains links to the individual Help articles for each Superbadge.  

If you’re still stuck, submit a case with the Trailhead Help team.