I believe prioritising is the key here. There are phases. There will be times when your studies will require more time and you will have to focus on them more than the other 2. But I don't believe there should be days where you only and solely focus on 1. In order to enjoy any of the 3, you need to find balance. And when you enjoy what you're doing, you get better at it.
The trick is to plan in advance. I assume work has set hours so, any hours that aren't in your working hours can be planned. And then remain very set to what you have planned, otherwise you will not trust you r plan anymore and It will not work out. If you have set to study for 2 hours after work and you get a last minute message from your friends asking you to come out, stick to the studies!
But take it easy. Don't stress on it too much, and remember to do a bit of everything.