The biggest one should be 1929, because it is normal to repeat for one or two years because of exam mistakes. Of course, if our class had this in 87, it wouldn't be normal ~ ~
From the age of 20 12 to 18, the brain is basically the most flexible, and basically it will not lead to good or bad academic performance because of the brain (individual). Therefore, as long as I study hard, I will recognize those who are about half a year younger than me (I was in February and March) and have excellent grades ~ ~