If you have a student who for example is repeating a year, you can change his/her year group by going into the student and updating the year group.
In this scenario, the student will inherit the ladders for the year group he/she is moving into. This means if you have made lots of changes to the ladders year on year, the students may lose some assessments or gain objectives which weren't previously available to his/her year group.
If you are unsure how ladders are stored within Learning Ladders for different year groups, please read our guide on making changes to your ladders.