the explanation of subject of the publication of our institute.

Hello there!

I just read your two messages and they seem to be quite in order. Is it for curriculum development?

The subject titles are coherent. Well done.

You might want to add more details here:
Subjects may be further subdivided BY........

a slight improvement here on consistency:

Although the main interesting issue is electoral education in high school, the issues could be widened to democracy education in schools and outside.

Although the main interesting issue is electoral education in high school, the issues COULD WIDEN to democracy education in schools and outside.

a slight improvement here on word choice ( in relation to is a bit wordy) :

Subjects and materials that your organization considers important in relation to youth election education(democracy education.

Subjects and materials that your organization considers important CONCERNING youth election education(democracy education.