MySQL :erreur dans votre syntaxe SQL | LIMITE 0, 25

il vous manque une parenthèse fermante à concat fonction

SELECT equivalent FROM tb_student_record INNER JOIN tb_student ON tb_student_record.stud_id=tb_student.stud_id 
WHERE tb_student_record.instructor_id = 'INST-20131296' 
AND tb_student_record.criteria_id = '1' 
AND tb_student_record.class_record_id = '1' 
AND (CONCAT(stud_fname, ' ', stud_lname) = 'Jeffrey Oliveras' )
AND tb_student_record.term = 'Prelim'