As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings In a course create a lesson with at least two content pages and one question page. In the lesson settings, enable Availability -> Allow lesson to be attempted offline using the mobile app In the first page add links to the next page and end of lesson In the second page add links to a random page, the first page and the end of lesson Enrol one user as student in the course where the lesson is. Create a Token for the student user Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL REST call simulating a WS client with the student user . You need to replace the wstoken, lessonid (the lesson instance value). curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'lessonid=4&wsfunction=mod_lesson_get_pages_possible_jumps&wstoken=12a2a65aeea2a177055e233f9e303218&moodlewssettingfilter=true' | python -m "json.tool" Now check that calculatedjump for all the jumps is always a value > 0. There is an exception, when the jump is to -9 (EOL) the calculatedjump will be always -9 You can verify if the calculated jumps are correct in this way: If the jumpto is -1, it means that the calculatedjump must be the next page in the lesson id (according to the order). If the jumpto is -40 it means that the calculatedjump must be the previous page in the lesson.