looking for old school exercise books
TL;DR
I'm looking for pen and paper exercise books to work on the fundamentals of European Portuguese.
Details
I've been working on my PTPT for about a year: Praktika, Practice Portuguese, YouTube, another website for basic vocabulary. I'm doing okay. Not great, just okay. What I need, what I used when I was a kid growing up learning other languages, are exercise books that require actual writing. (Writing has been shown to be an effective way of reinforcing learning, better than just typing on a phone.)
I'm not 8 years old, so I don't want cute little cartoons. I'm looking for exercise books that introduce vocabulary or a grammar point, and then reinforce them through short written exercises.
For example, let's say the grammar point was definite articles. The exercise might have a variety of words (masculine, feminine, singular, plural) and you have to write the answers:
Question: the cake - Answer: o bolo
Q: the pen - A: a caneta
Q: the cakes - A: os bolos
Q: the pens = A: as canetas
I've chosen something very simple here just to demonstrate what I'm talking about.
I'm looking for suggestions for these sort of exercise books for European Portuguese.
Thanks, all.