Chemistry Examination Topics and Units If you are a Grade 12 Science student who is studying Chemistry , you must focus your study on the units and topics outlined below.  The Chemistry subject is taught at Grade 11 and 12 in the Upper Secondary in schools in PNG. Students must fully study the units and topics as examinations Questions for Grade 12 covers both Grade 11 and 12 units and topics in chemistry.   Read more on: https://edu.pngfacts.com/chemistry-examination-topics.html