The test strips suck, but it’s better than nothing. Get yourself an API test kit when you can, but keep an eye on your water.
look up nitrate cycle and that will help you keep them alive longer. Understand bio load and how to keep beneficial bacteria alive.
over filter, slightly under feed, water change, water change, water change. Don’t give up, get another job and start your own business. You will need lots of money to keep these kind of fish.
do all your chores and anything your parents ask if you, don’t give them any lip, you won’t be getting any big tanks other wise. When they see how passionate about it you are they will eventually support you when you need it the most.