It would proceed through this screen with the sound from the previous screen.
Pressing Play again would take me to the previous screen and 2 overlapping sounds would play together.
Pressing home would take me to the main screen with home's screen sound and all other previous sounds playing as well. (including the correct/wrong answer sounds too)
Close each screen before opening another screen. This way only 1 screen is open at a time and all clocks are automatically disabled (on the closed screen) and / or
uhm, I just wanted to ask is there any way to stop the app from running in the bg? like it keeps playing the sound and scoring. I searched it but found that apps running in the bg isnt a feature in app inventor. what i'm missing?