If you search up the 2019 shortlists there should be pdfs with names of all the shortlisted candidates. There’s quite a large discrepancy between subjects because some are more popular. For example economics usually has more entries and therefore also has more shortlisted candidates
I entered the Junior category for the first time and am excited to see how my entry compared with everyone else's! I chose to do the question on 'Who was the best leader of all time?'