When I first played Dr Driving, I realized the game rewards smooth control more than speed. One thing that helped was lowering the steering sensitivity and focusing on clean turns instead of rushing. Completing missions without hitting walls gives better progress over time. Also, try practicing parking levels - they really improve your steering accuracy.
By the way, when I’m not playing, I sometimes watch movies on my phone. I recently found a lightweight streaming app that works offline and doesn’t lag.
https://apkcineema.com.br/