Your wait time has to exceed normal processing time by a significant amount so would not normally be a case for mandamus. Looking back you appear for have received AIP in mid 2025 so you are experiencing normal processing and that wouldn’t normally be a case where filing a writ of mandamus would be effective. If, for example, your processing time was many years longer than other similar applications then that would be a case for mandamus. Everyone else who received AIP after you is still likely waiting for second stage as well and filing a writ of mandamus is not supposed to get you faster processing than everyone else. There are likely thousands of people waiting after AIP but there is a limited annual quota so IRCC can only land so many people per year. Did you hire a lawyer and did they recommend filing?