S = GATE Score (normalized) of a candidate,
M = Marks obtained by a candidate in a paper,
Mq = Qualifying marks for general category candidates in the paper,
Mt = Average Marks of top 0.1% or 10 (which ever is higher) of candidates in the paper,
St = GATE Score assigned to Mt (around 900), and
Sq = GATE Score assigned to Mq (around 300).
Mq is usually 25 marks (out of 100) or µ+s, whichever is higher. Here µ is the mean of marks in a paper and s is the standard deviation.
GATE score remains valid for up to two year from the date of issue.