How does having more than one test a day in school affect you?

suppose you get stressed about it. but im not completly sure :)

It can make you more stressed out and have a lot more to do at once, as you have to study 2 different things, but it does not make that much difference. A good way to think of it is that they are both out of the way if they are in the same day, and you can relax that night with no studying to do. As long as you start preparing in advance so it is not a horrible last minute rish and hopefully have a little break between, for a snack and to relax a bit, then you will be fine :)

Not in a big way, it might just be that I will be tired at the end of the day.

well to start off…think of it as “If i take like three tests today, how will my mood be towards the end of my school day”. Of course when you take several tests in a single school day, you will probably grow tired and be stressed and your mood could be deprived, tired, bored, annoyed just from taking several tests in a day. However, if either your tests are easy and you pass them, you may feel confident and be in a good mood. But a teenager will most likely always have to take the challenge of taking one or more tests in a school day.

Try having two three-hour university exams, each worth 70% of your final grade in one day.