Do not skip the theory. The Poliedro system relies on a specific study flow:
Do not just read the PDF on your phone. That is a waste of time. poliedro apostilas pdf
Poliedro has a partnership with Editora Moderna to sell their "Sistema de Ensino" books to regular schools. You can buy these individual books at large bookstores (Livraria Cultura, Saraiva, Amazon BR). Search for "Coleção Poliedro Moderna" . Do not skip the theory