ARKTIK Public Speaking Confidence Cohort — Grades 6–8 $399.00 The ARKTIK Public Speaking Confidence Cohort helps students convert written thinking into calm spoken explanation. ARKTIK Education Marketplace › ARKTIK Public Speaking Confidence Cohort — Grades 6–8 Speaking with Confidence as an Aviator Added! The ARKTIK Public Speaking Confidence Cohort helps students convert written thinking into calm spoken explanation.