6^th grade (A)

1^st grade (B)

2^nd grade (C)

Multiple comparison

M ± SD

M ± SD

M ± SD

Homework

3.94 ± 0.24

3.77 ± 0.67

3.56 ± 0.85

B < C < A

Reviews

3.32 ± 0.64

2.82 ± 1.01

3.45 ± 0.78

B < A, C

Preparations

3.53 ± 0.62

2.88 ± 1.06

3.04 ± 1.02

B, C < A

Small tests

3.47 ± 0.66

3.32 ± 0.98

3.43 ± 0.85

Test plans

3.24 ± 0.61

2.75 ± 1.12

3.55 ± 0.90

B < A < C

Daily plans

3.53 ± 0.56

3.17 ± 1.11

3.26 ± 0.87

B, C < A

Attitudes in class

3.41 ± 0.61

3.04 ± 0.87

3.36 ± 0.74

B < C, A

Taking notes

3.59 ± 0.56

3.44 ± 0.99

3.51 ± 0.86

Speech in class

3.62 ± 0.49

3.17 ± 0.85

3.36 ± 0.87

B, C < A

Syllabus

3.74 ± 0.51

3.36 ± 1.25

3.23 ± 0.98

C, B < A

Time of after-school activities

2.62 ± 1.37

2.08 ± 1.36

2.79 ± 1.47

B < A, C

Study time on weekdays

2.59 ± 0.99

2.08 ± 1.12

2.53 ± 1.30

B < C, A

Study time on holidays

2.50 ± 1.02

2.66 ± 1.22

2.70 ± 1.41

Home study habits

3.53 ± 0.36

3.06 ± 0.87

3.24 ± 0.73

B, C < A

Subject study habits

3.65 ± 0.37

3.35 ± 0.79

3.55 ± 0.67

B < C, A