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About Grade Gorilla

This site is run by teachers, for use by teachers and students

Profits are minimal and we use what little revenue we gain from accounts to invest in new content, security, and webhosting.

Grade Gorilla is a registered Hong Kong Limited Company. (Company Registry 2931259).
We are a group of teachers currently based in Hong Kong who have been working in international schools around the world, but based on UK and English Language Curriculum (e.g. IBDP).

Registered Office Address:
Room 1628, One Island South
2 Heung Yip Rd
Wong Chuk Hang
Hong Kong
+852 55657072

Grade Gorilla has been operating as a website since 2009, and a Limited Company since 2020. We now run two sites:

  • Revision and formative assessment. Self-marking questions. (KS3, GCSE, iGCSE, IBDP)
  • Interactive 'ebook' textbooks. (Physics GCSE and iGCSE).

Personnel Involved in our development:

  • Jon Gilchrist : Founder / Physics Content / Database manager (Registered teacher in UK and HK)
  • Carol Boag : Chemistry Content (Registered teacher in UK and HK)
  • Su Cowland : Biology Content (Registered teacher in UK and HK)
  • Dr Rachel Yu: Chemistry Content (Registered teacher in UK and HK)
  • Dawn Strachan: Biology Content (Registered teacher in UK and HK)
  • Aradhana Saraf: Business Adviser
  • Al Chalabi: Business Adviser

If you wish to request any more information as part of our GDPR compliance, update or delete your personal information, or any other issues, please contact us at