Thank you for your comment, it's much appreciated! Technically, you're right. But Callum is studying an integrated master (along with external students from did their undergrad at other universities who take the course as a stand-alone master), so even though he is formally an undergrad (for fee purposes), he could have graduated last summer with a BA last summer (like Neel did in 2020). If you'd like more information check https://en.wikipedia.org/wiki/Part_III_of_the_Mathematical_Tripos or don't hesitate to ask me further.
Thank you for your comment, it's much appreciated! Technically, you're right. But Callum is studying an integrated master (along with external students from did their undergrad at other universities who take the course as a stand-alone master), so even though he is formally an undergrad (for fee purposes), he could have graduated last summer with a BA last summer (like Neel did in 2020). If you'd like more information check https://en.wikipedia.org/wiki/Part_III_of_the_Mathematical_Tripos
or don't hesitate to ask me further.