Speaking of exam preparation first,
And simple is best
2019 Center Examination Science 2 Past Questions PDF file can be viewed
The answer is attached to the lower part of the past question PDF file.
You can change to a different problem by pressing the "Another problem" button.
Other Center Past Question Apps
"English" "Japanese" "Mathematics" "Science" "Geographic history" "Civil"
Please download it by all means.

The introduction video is a past nursing question application, but the usage is the same

I can do it.

Extending blog, center past question app 2019 version
http: //localhost/app/android/jp/005-2019-senntaqa.html

Extending blog, center past question app 2018 version
http: //localhost/app/android/jp/004-2018-senntaa.html