How to compare two libreCalc files and generate comparative graph from that files?

How to compare two libreCalc files and generate comparative graph from that files in word format.
I want to generate monthwise progress graph of each student and display that report into PDF or jpg format.

To compare there is Menu/Edit/Compare document

Comparing versions of a document

But I think it is not what you want.

Generate a comparative graph, I think needs you explaining with detail what you want achieve and what data you have.

I want to generate comparative month-wise graph of student’s progress.

What does this student progress data look like? And how is it split into different files? Is it one file per student?

If your data is contained in many different spreadsheets, you could link to that data from another spreadsheet. That’s as easy as selecting a cell in one spreadsheet, entering =, and then clicking on a cell in another spreadsheet.