Classification of ap ssc grades

AP SSC results 2010...
http://www.results.manabadi.co.in/SSCResults2010.htm

Andhra Pradesh State government has introducing the nine-point ‘relative grading' system. In CBSE mode the grade is decided on the percentage scored by the candidates. In AP new system Subject grades and aggregate grades will be assigned to the candidates depending on their relative performance in the subjects.
Under the new system, the top 12.5 per cent of the passed candidates will get A1 grade while students below 12.5 per cent and above 25 per cent will get A2 grade. Students who figure below 25 per cent and above 37.5 per cent will get B1 grade. The B2 grade will be given to candidates who figure in below 37.5 per cent and above 50 per cent group among all the passed candidates. Similarly, the grade will drop after every 12.5 per cent.