This is my usual go-to recommendation for study/homework skills:
https://www.nasponline.org/books-and-products/products/books/titles/hops-for-parentsIt's a clearly laid-out, straightforward system for explicit instruction in study/homework/organization skills. This is the parent edition; there's also a school-based edition, which is designed to be used as a semester-long systematic intervention, including a couple of parent sessions.
Here's the school-based volume:
https://www.nasponline.org/books-and-products/products/books/titles/hops-interventions-for-schoolsHard to beat the tips in Dawson/Guare. This is the teen edition:
https://www.amazon.com/Smart-but-Sc...ut+scattered+teens&qid=1582040763&sr=8-1They also have some organizational products:
https://www.amazon.com/Work-Smart-Academic-Planner-Revised-Write/dp/1462530206/