Why are 6 days a week for students still a norm

Although people complain about 6 days per week work still more concerning is the fact that lot of schools and even some colleges(at least tier 3) atleast where I live (Hyderabad) still have 6 days a week and it's not changing when ever asked teachers say that students get a lot of festival holidays but most festivals are not rest periods due to which I see lot of students don't celebrate festivals cuz they didnot have a holiday aside from Sunday and Saturday sports day or half day is excuse cuz they will remove them for secondary education or higher