The introduction of assessment orientated policy in 2016 marks a significant change in Scottish education as it will establish standardised national testing. Teachers in Gaelic medium education are well placed to offer insights as they have had considerable autonomy regarding assessment and this paper is the first to consider the impact of this specific reform in Scotland. Three linked themes emerged from thematic analysis based on focus group data. Participants were keen to discuss the climate regarding Gaelic medium education linking concerns with the ongoing reform of assessment policy. Policy and practice implications are discussed as well as the anticipated impact the assessments may have on pupils and teaching staff. This paper contributes to the understanding regarding the role of standardised tests in education and feeds into an understanding of policy development through the lens of immersion education highlighting uncertainties held by teachers when reform is underway.