Charnwood College, formerly Burleigh Community College, has seen 97% of students achieve five A* - C grades, 3% up on last year.
92 students (34.3%) gained three or more A* or A grades and 99% achieved at least one GCSE pass.
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A large tent has been put up around the area while investigations continue.
The kind gesture touched the hearts of many who shared and retweeted words of support for the officer on Twitter.
Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.