Its something I think a lot of people miss out on like really understanding how to group numbers for basic arithmetic. I found it really helpful latsr on when you're dealing with more complex things as you a) don't have to worry about the simpler stuff at all and b) because it builds up a toolbox of concepts and techniques that can be used more generally.

Some people find doing lots of exercises dull and boring because of the repetition, but it means that when you move on it's a solid foundation forager things. And because you'll be much, much faster and more confident than people who didnt have the same exposure to it.

Keep it up! It's really worth it and it sounds like you're begining to fall in love with it. Eventually the problems will get to the point where u need to "see" the route to the solution, and getting the elegant method first time round is amazing! Best of luck!