Answer:
A) experimental
B)  The important factors are : Type of instruction, scores and  High schools,
    The factor levels are : 
    Level -1 which comprises of  3 highschool, 
    Level -2 which comprises of  highschool and the highschool has  4   sections   and each section has 24 students
    Factor level combinations: 
   Level 1 : computer and standard based combination
C) Within the subject : 24 students 
    Between subject : High school
D) score of the test
E) student
Step-by-step explanation:
A) The study is experimental because of the random assignment of two different types of instruction to the students which will control/affect the technique of teaching without just observing the performance of the students from the side
B) The important factors are : Type of instruction, scores and  High schools,
    The factor levels are : 
    Level -1 which comprises of  3 highschool, 
    Level -2 which comprises of  highschool and the highschool has  4   sections   and each section has 24 students
    Factor level combinations: 
   Level 1 : computer and standard based combination
C) Within the subject : 24 students 
    Between subject : High school
D) The dependent measure  is the score of the test
E) The basic experiment unit of the study is : student