Hey mums, hope you don't mind my sharing this info here 
I'm a student ambassador at an NGO called Wave Learning Festival. Set up by a group of Harvard and Ivy League friends, Wave is essentially a charity platform where students can learn eccentric subjects they're actually passionate about, outside of the classroom via zoom lectures taught by undergrads at top-tier universities. I had a class taught by a students at Oxford and Yale! :0
Wave aims to close the disparity gap and lessen social inequity for learning; so Wave courses are completely free and non-committal!
I signed up for 4 courses when I first heard about Wave, and those were: "Being a Smart Sheep; Human Rights in Consumerism", "Navigating Ethics: Right and Wrong", "Macbeth: Feminism, Murder and Madness" and "The Placebo Effect"! These courses lasted 2-3 weeks with lessons 3 times a week so it was quite relaxed. The teachers were amazing, and I gained some very valuable contacts via communicating with other students across the world on Zoom and chatting with my teachers. The content I learnt was genuinely priceless to me; I see the world so differently every day now, and I appreciate these lessons so much.
My mum was the one to recommend me to try out some Wave courses which ended up being one of the best decisions I've ever made, and so I'm here to return that favour to anyone else! I highly encourage any budding young students who want to learn more to check it out:
Wave Learning Festival
also!! you can moderate classes (basically the role of a TA) which will earn you volunteering hours, and I'm currently doing this for my DofE since I can't volunteer in person at charities anymore!