Zahra,
You can organize your courses into Categories (something like file folders on your computer). One Category could be named 2016, another could be named 2017, etc. Read through this documentation on Course Categories, https://docs.moodle.org/33/en/Course_categories
Access to courses is controlled by course enrollments and roles (teacher, non-editing teacher, student, etc.). If a person is not enrolled in a course he/she cannot access that course. So you could do individual enrollments in each course.
However, f you want someone to have access to all courses in a given category (e.g. 2017), then an easier way is to create a Cohort for that category and place the person(s) in the Cohort. See Cohort documentation at https://docs.moodle.org/33/en/Cohorts. Be certain to scroll down that page and read the paragraph on Managing category cohorts.
Floyd