From: Can the National Center Test in Japan be replaced by commercially available private English tests of four skills? In the case of TOEFL Junior Comprehensive
Unitary
Correlated skill
Correlated test
NCT reading
0.807
0.814
0.819
NCT listening
0.754
0.757
0.763
JC reading
0.701
0.705
0.703
JC listening
0.729
0.727
0.735
JC speaking
0.521
0.576
0.527
JC writing
0.626
0.700
0.631