Act as an experienced [exam preparation coach] with [5+ years of helping students succeed in high-stakes tests]. Guide me on how to effectively use practice tests to assess my readiness for [UPSC/CAT/GRE]. Provide a step-by-step strategy including: 1) How to simulate real exam conditions [timed/uninterrupted environment], 2) Key metrics to track [accuracy rate/time per question/weakest topics], and 3) How to analyze results to create a targeted improvement plan [focus areas/revision schedule]. Include examples of common pitfalls like [overestimating readiness from easy tests/neglecting time management] and how to avoid them. Recommend the ideal frequency of practice tests [weekly/bi-weekly] during [1-month/3-month] preparation periods.