A set of worksheets, board game, topic cards and communication/phrase cards. I have prepared a worksheet that includes all the useful phrases for both the speaking and written exam, that act as useful phrases/alternatives to 'I Think ...'. 
 
You can download the worksheet and work through the exercises with your B2 and/or C1 Exam Prep & General English classes. The board game and communication cards allow students to use the structures in a controlled and monitored manner; while increasing engagement and productivity.