Supra-curriculars are the activities you do to demonstrate:
You can develop these attributes in a huge number of different ways, such as by listening to podcasts and watching lectures; reading books or the news; or getting out into the world, like by volunteering in a related area.
These are key qualities that Oxbridge admissions tutors are looking for. If you do the work, they will come across in your personal statement, assessment essays and interview. You will have more interesting examples to draw from, will be better able to connect different ideas, and will talk with genuine excitement.
TAKE THE INITIATIVE
Follow your own interests.
It's completely fine to ditch a book if you are finding it boring, or tp just read the most exciting chapters.
You will have more interesting things to say if you focus on your genuine passions.
MAKE IT ROUTINE
Start early and do a little everyday.
Read the news on your way to or from school, listen to podcasts while exercising, or watch a lecture before going to bed.
You will develop a deep understanding of your subject and develop thoughts on the key ideas.
REFLECT AND RECORD
Make notes and keep a record
Critically reflect on arguments, their potential objections, and how they connect to other ideas.
You will develop a unique perspective and a bank of resources for your PS and interview.