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I remember years ago in music school they used this book with us
It is just to practice reading.
Here's an exercise I found helpful with other instruments:
Put together a cheat sheet of all the info you need, such as notes on the staff and the string/fingerboard diagram if you don't have that memorized yet.
Take some sheet music and transcribe some tablature. Do this enough and your mind will eventually connect the notes to strings and fingering. And until that time, you've got tabs.