Digital notes are often cheaper (or free) compared to bulky, printed textbooks.
There are several online resources where you can find ZIMSEC O Level Chemistry notes in PDF format for download. Some popular sources include: zimsec o level chemistry notes pdf download
Remember, a pass in ZIMSEC Chemistry (Grade C or better) requires knowing how to apply the notes, not just owning them. Use the PDF to memorize the definition of a mole, but practice calculating the mass of sodium chloride produced in a reaction. Digital notes are often cheaper (or free) compared