The TCK automatically adapts to the repository. If the repository reports (in the repository info) that it is a CMIS 1.0 repository, only CMIS 1.0 tests will be executed. If the repository reports that it is a CMIS 1.1 repository, then CMIS 1.1 tests will be executed. All CMIS Workbench versions since 0.9.0-beta-1 do that.
If a TCK test fails, it's either a repository issue or the repository reports the wrong CMIS version.