Why past papers still matter
Past papers are the only materials that were actually sat under exam conditions, by real candidates, with real timing pressure. No practice question — ours included — can fully replicate that. They're the closest thing to a dress rehearsal you can get.
The catch is scarcity. There are only six official TARA papers in existence, and once you've sat them under timed conditions, they're spent. You can't un-see a question. That makes when you use them at least as important as whether you use them at all.
This is why the BMAT and TSA archives matter so much for TARA. They give you the volume to build the skill, so you can save the genuinely-TARA material for the two or three timed run-throughs that actually tell you whether you're ready.