: Balancing equations, stoichiometry, limiting quantities, and oxidation-reduction.
: Periodic table, stoichiometry, bonding theory, and gases.
While the "3000" book is excellent, it is old (the latest edition is from 2010). The fundamental chemistry hasn't changed, but the presentation has. If you cannot find a legitimate PDF, consider these modern alternatives:
Open the PDF to a chapter you are studying in class (e.g., "Thermochemistry"). Randomly pick 10 problems. Attempt them without looking at the solutions.
Which of those would you like?