Exclude records that match or many instances of a value from an oracle query

SELECT     
STUDENT_NUMBER,
LAST_NAME,
FIRST_NAME,
STOREDGRADES.STORECODE, 
SECTIONS.TERMID, 
STOREDGRADES.COURSE_NAME, 
STOREDGRADES.COURSE_NUMBER, 
SECTIONS.SECTION_NUMBER, 
STOREDGRADES.TEACHER_NAME, 
STOREDGRADES.GRADE,  
STUDENTS.GRADE_LEVEL

FROM         
PS.STOREDGRADES STOREDGRADES
LEFT JOIN PS.STUDENTS STUDENTS ON STOREDGRADES.STUDENTID = STUDENTS.ID 
LEFT JOIN PS.SECTIONS SECTIONS ON SECTIONS.ID = STOREDGRADES.SECTIONID
LEFT JOIN PS.COURSES COURSES ON STOREDGRADES.COURSE_NUMBER = COURSES.COURSE_NUMBER

WHERE     
(STOREDGRADES.TERMID >= 2500) 
AND (STOREDGRADES.TERMID <= 2599) 
AND (STOREDGRADES.STORECODE IN ('Y1')) 
AND (STUDENTS.SCHOOLID IN (61)) 
AND (STUDENTS.GRADE_LEVEL = 10)
AND (STUDENTS.ENROLL_STATUS = 0)
AND (STOREDGRADES.GRADE IS NOT NULL)

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