Z is for…Zzzzzzz. You need several hours sleep each night to be able to concentrate properly at school. The time you should go to bed will depend on how old you are and whether it’s a school night or a weekend, but if you are in primary school and going to bed at 11pm every night you are not getting enough sleep.
Talk to your parents or carers, and your teacher, and agree a bedtime that will give you enough sleep to be able to work properly at school. Your family will probably make exceptions for special occasions, but other than that make sure you stick to it.
I hope this A-Z of learning has been useful. I hope that you have seen lots of improvement in your work at school, and I hope your teachers have noticed too.