This study was conducted to explore secondary school students' relationship of test anxiety with their achievement in the subject of English. Gender differences were also measured in terms of test anxiety. Data was collected from 2,270 tenth grade students (1,126 males and 1,146 females) selected from 80 schools in eight districts of Punjab province. Relationships were measured by using simple correlations (r), multiple correlation (R) and standard regression coefficient (β). ANOVA was used to find out the differences, the Eta square values were also included. The results of the study indicated that there was negative correlation of test anxiety with students' achievement in the subject of English. It was also concluded that female students had higher test anxiety than male students.