<p><p> This study attempts to assess the achievement of high and low stressed senior secondary science students. A sample </p> <div>of 631 students was randomly selected from different institutions of Meerut province. They were administered </div> <div>Psychological Stress Scale for Science Students (PSSSS) developed by the researcher himself. Mean, S.D., and t–test, were </div> <div>used to analyze the data. Results show that the stress dimension examination and achievement has been emerged as the major factor causing </div> <div>stress, while health as the least causing factor for stress. The means of achievement of low stressed students for total psychological stress and its </div> <div>all dimensions were higher than that of high stressed students. It leads to the conclusion that high stress affects negatively the achievement of </div> <div>science students.</div></p>