There are currently no Learncoach videos for Level 3 Chemistry, however it says on their website that more videos will be put up this year. Once the Level 3 Chemistry ones are uploaded, links will go here.
No Brain Too Small is a New Zealand revision site for Science. There are last minute revision sheets, flash cards, past exam questions and other good activities found on the site.
Doing past NCEA exam papers is a really good way to study, here are the links to past exams/solutions.
Past exam papers 91390, 91391, 91392
Answers (Look for Assessment Schedules)
Cut Scores
Past exam papers 91390, 91391, 91392
Answers (Look for Assessment Schedules)
Cut Scores