I had 12 years of pre-college education, 4 for university, 2 for Masters and 2 years of classes in my PhD ( I am candidate now) and I think I had exams while I was fasting in each year and it wasn't a big deal. I rarely even see a Muslim student break fast for exams. And I think people saying they request accommodation this week, that's usually because of Eid and the couple of nights before that we believe it is the night that quran was revealed to the prophet Mohamed, so people want to pray more at night (it is a probability not specific night from 21,23,25,27 and 29 of Ramadan)

How does your focus evolve or progress while fasting? Any relevant difference between the first days and the last days?

Simply, when you eat 3 meals a day, your body and mind is way less performant than what it could be in a good portion the day. So having all daytime fully productive helps. I personally don’t feel any desire to eat or drink after 1st day.

People play professional sports while fasting during Ramadan. I have no idea how they do it but having access to nutritionists probably helps.

In Germany, Muslim students had their exams excused this week, when everyone else wrote them. They can take them next week

I wonder why, Muslims only make up 5% of Germany's population, fiscally this wouldn't make much sense given that they would have to make a second exam paper & provide more labour

For some people, not everything is reduced to being as cost effective as possible.

Come to think of it, it was quite nice how they accommodated Muslims; however, they could have just postponed the exams.

the German's regain some reputation for hospitality.

Terrible idea and precedent IMHO.

Why?

You get used to it