What do the column titles mean in my students grade book on family access (circled letters below)?

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      MT1 is the mid-term grade for first quarter – about halfway through first quarter
 
      T1 is the first quarter grade – halfway through first semester

      MT2 is the mid-term grade for the second quarter – about halfway through second quarter

      T2 and/or S1 is the second quarter or first semester grade – halfway through the year

      MT3 is the mid-term grade for third quarter – about halfway through the third quarter

      T3 is the third quarter grade – halfway through the second semester

      MT4 is the mid-term grade for the fourth quarter – about halfway through the fourth quarter

      T4 and/or S2 is the fourth quarter or second semester grade

grade book
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