Exam Time Calculator

We, the mathematicians, are often asked to bell the cat when it comes to any kind of calculation. This is the case during the exams in my school, when many lessons are being examined at the same time, a lot of extra timers exist, a 30- and a 5-minute notice must be given for each particular group and keeping order of all these times appears to be a nightmare.

I have developed a user-friendly tool which helped us a great deal. I am attaching it here, hoping to help your school as well.