Level 2 and 3Watch this thread
In my case level 2 will be my introduction to OU exams, but some level 1 courses have exams as well now.
It has a fact box that states how many TMAs and/or iCMAs it has and whether it has an end of module assessment or examination at the end.
So check the module website, without the specific modules, no one here can give you an answer.
Level 1's are introductory designed to bring people up to the same level of study and knowledge and it does get harder the further you get.