Guarantee? No. Improve your chances by 500%? Yes. If you failed, you likely struggled with time management or specific topics (e.g., algebra). Past papers turn those unknown weaknesses into known targets.
The TTPS exam is a timed test, usually 90 minutes to 2 hours. By working through past papers, you internalize the rhythm of the exam. You learn to recognize a "trick" question immediately and skip it to return later.