ANSWER:

Your fast is valid since you did this mistakenly.

Well today I woke up and just observed the minute arrow on the clock and eat the suhoor as it was showing that 5 minutes left. So after eating I opened the window and saw it was lighting up and then checked the clock again only to see that it has been 1 hour since the Suhoor time ended. Well in this case is my fast valid or not?

Fasting | May 23, 2019 6:04 am
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We have very long school days and while I am fasting at school, I get being lightheaded, dizzy and possible for me to faint. I can’t even focus on anything. Can I make up those days?
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While making up for the missed Ramadhan fasts if that day falls on monday & it is also one of the white days of the month should we only intend that we are making up our missed Ramadhan fasts & fast that day or should we intend for all three that is im fasting to make up fard of ramadhan plus sunnah of monday and white days to get the reward ??