grade sheet

FOR x = 1 TO 3
    READ y$
    PRINT y$
    PRINT
    PRINT "Enter mark of Quiz"
    INPUT q1
    PRINT "Enter mark of Assignment"
    INPUT a1
    PRINT "Enter mark of Midterm"
    INPUT m1
    PRINT "Enter mark of Final"
    INPUT f1
    sum = q1 + a1 + m1 + f1
    PRINT "your mark"; sum
    tsum = tsum + sum
    IF sum >= 80 AND sum <= 100 THEN
        PRINT "you have got A+"
    ELSEIF sum >= 70 AND sum < 80 THEN
        PRINT "you have got A"
    ELSEIF sum >= 60 AND sum < 70 THEN
        PRINT "you have got B"
    ELSEIF sum >= 50 AND sum < 60 THEN
        PRINT "you have got C"
    ELSEIF sum >= 0 AND sum < 50 THEN
        PRINT "you have got F"
    ELSEIF sum < 0 OR sum > 100 THEN
        PRINT "Your result is invalid"
    END IF
NEXT x
DATA "FOR ART OF LIVING"
DATA "FOR ENGLISH"
DATA "FOR ISE"
tavrg = tsum / 3

PRINT "AVERAGE OF YOUR TOTAL MARK"; tavrg
IF tavrg >= 80 AND tavrg <= 100 THEN
    PRINT "you have got A+"
ELSEIF tavrg >= 70 AND tavrg < 80 THEN
    PRINT "you have got A"
ELSEIF tavrg >= 60 AND tavrg < 70 THEN
    PRINT "you have got B"
ELSEIF tavrg >= 50 AND tavrg < 60 THEN
    PRINT "you have got C"
ELSEIF tavrg >= 0 AND tavrg < 50 THEN
    PRINT "you have got F"
ELSEIF tavrg < 0 OR tavrg > 100 THEN
    PRINT "Your result is invalid"
END IF