You need to test for more than just PH, You need to test for Ammonia, Nitrite and Nitrate. PH is the least important.
As you've been told many times on this forum you are going to kept doing problems as long as you are just doing water changes 'when you can'
You NEED A regular water change cycle. 25% once a week is what I do. As long as you are just doing them 'whenever you can' and not having a routine you are going to continue having problems.
I know you say you are only 13 and can't do water changes, but I tell you now, I had A LOT more time when I was 13 than I do now, even with homework and social activity. And I still manage to fit in water changes for 4 tanks once a week. If you have the animals you NEED to fit in the water changes. That's all there is too it
I'm sorry if I sound harsh, but I've seen you post so many threads with problems, and in all of them you've said that you don't do regular water changes, that you don't have time, that you do it when you can. And you've always been told that isn't good enough. You need to get a routine of regular changes if you want to keep your animal healthy