You can find past papers and information linked below. The official TMUA website is here.
I used to have playlists here working through questions from TMUA papers – these have now been replaced with a free online course where you can work through past TMUA questions with my video solutions:
I also occasionally run some online small group classes (not free) to prepare for these papers – see the schedule and sign up here.
Past Papers and Solutions
If you are preparing for TMUA you might also find my MAT content useful – the syllabus is similar and the short answer questions from the MAT are particularly good practice for the TMUA too.
Also, here’s a video about writing amazing personal statements, particularly aimed at maths: