I need a 20 min lesson on Moodle to troubleshoot a problem

Description

I have a Moodle site and need some advice/talkthrough to solve a problem with setting up lessons.
I need to set up a series of lessons which are only accessible when a student has taken and passed the previous one.e.g.:Student A takes Lesson 1 and passes the multipe-choice questions Student A then is granted access to Lesson 2Student A takes Lesson 2 and passes the multipe-choice questions Student A then is granted access to Lesson 3etc.
You must have:1. Great Moodle knowledge2. Good English3. Ability to talk me though this with screensharing