Due to the COVID-19 pandemic, universities were forced to adopt a remote learning model, which introduced a number of stressors into college students' everyday life and study habits. The current study investigates if students' study-related stress increased after the pandemic's onset and how individual and contextual factors moderate this potential stress increase. Longitudinal survey data about students' stress levels and self-efficacy in self-regulation were collected before and after the onset of the COVID-19 pandemic at a public university (N = 274). Regression analysis results show an overall increase in studyrelated stress levels after the onset of the pandemic.Students with self-efficacy in self-regulation reported lower stress increases; students with higher mental health impairment and limited time for coursework reported larger stress increases. To address students' stress levels and strengthen coping resources, universities should consider providing students with resources to improve their self-regulation and time-management skills.

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Self-concept in mathematics (MSC) and interest in mathematics are important predictors of whether a student will choose to major in a science, technology, engineering, or mathematics (STEM) field at university. Research on the big-fish-little-pond effect (BFLPE) has shown that both predictors are affected by the achievement composition of students in schools. That is, given the same individual ability, students in higher achieving schools exhibit lower MSC and interest in mathematics than students in lower achieving schools due to social comparison processes. The BFLPE has been replicated in high school settings many times, but less is known about the long-term effects of this context effect. In the present study, we investigated the long-term effects of the BFLPE on the aspiration to major in and the actual decision to major in a STEM field at university. We used data from a German longitudinal study. The results showed no direct BFLPE on the aspiration to enroll in a STEM major at the end of high school or on actual enrollment in a STEM major 2 years after graduating from high school. However, small negative indirect effects of the BFLPE via MSC and interest in mathematics on the aspiration to and enrollment in a STEM major occurred. In sum, the longitudinal BFLPE on STEM major choice was small. Educational Impact and Implications StatementIn the present study, we used a German longitudinal dataset to investigate the long-term effects of schools' achievement-related student composition (big-fish-little-pond effect) on (a) the aspiration to major in and (b) the actual decision to major in a science, technology, engineering, and mathematics (STEM) field at university. Given the same individual achievement level, students in higher performing schools exhibited a lower self-concept and interest in mathematics (which then affected subsequent major choice). Social comparison processes can explain these results, as students evaluate their ability level by comparing themselves to their peers. The long-term effect of these social comparisons on enrollment in a STEM major at university was statistically significant but small. Furthermore, the results indicated that students compare their own individual achievement in the verbal and mathematics domains (dimensional comparisons) when choosing whether to major in a STEM field than compare themselves socially with their peers. Considering our results, educators should be aware of and potentially discuss such comparison processes when counseling students who are preparing to select their major at university.

Colleges and universities have increasingly worried in recent decades about college students’ well-being, with the COVID-19 pandemic aggravating these concerns. Our study examines changes to undergraduate emotional sentiments and psychological well-being from before to after the onset of the pandemic. In addition, we explore whether certain risk factors (i.e., prior mental health impairments, trait emotional stability) and protective factors (i.e., subjective socioeconomic status, parental education, household resources) predicted students’ emotions and their intraindividual changes due to the pandemic onset. We compared experience sampling method data from 120 students from before and after the pandemic onset, examining intraindividual trajectories. There was only little change in students’ emotions. Prior mental health impairment and trait emotional stability predicted students’ emotions, averaged across time points, but not emotion changes. Few associations with emotions were found for subjective socioeconomic status and parental education, but study-related household resources predicted levels and changes in emotions.

Students compare their achievement to different standards in order to evaluate their ability. We built on the theoretical frameworks of situated expectancy-value theory, dimensional comparison theory, and the big-fish-little-pond effect literature to examine the role of social and dimensional comparisons for ability self-concept and subjective task value (STV) in secondary school and university major choice. We used two German longitudinal data sets from different cohorts with data collection in 12th grade and 2 years after high school graduation (Study 1: N = 2,207, Study 2: N = 1,710). Dimensional and social comparisons predicted students’ self-concept and domain-specific STV in school: Individual achievement was positively related to ability self-concept and STV in the corresponding domain and negatively related in the noncorresponding domain. School-level mean achievement was negatively related to ability self-concept and STV in the corresponding domain. Dimensional comparisons were directly related to university major choice, social comparisons were only indirectly related.