These resources are for students aged 14-16, studying for GCSE, IGCSE or equivalent qualifications.

Subject Resource Notes
Computer Science Isaac Computer Science Resources for GCSE
Physics Isaac Physics Resources for GCSE include GCSE Physics lessons; Quick Quizzes; Mentoring scheme; Pre-16 events and preparation for A level.
Astronomy Cambridge Institute of Astronomy public pages The institute does recorded public talks and opportunities to discover new images and videos.
Maths NRICH Mathematics (secondary) See About NRICH. (there is also a section for parents)
Maths Millenium Maths project You can look through their public and schools events