Hi Yusif, emmmmmm, after three weeks, have you got any further?
As you can tell, not a lot of users of Schoology here, so not a lot of help, I am afraid. I don't even know what type of database Schoology uses, can't find enough information on the tool that would encourage me to look further. I even looked at this site, and it is being very bashful, Schoology doesn't seem to appear anywhere in a list of LMS's. I am wondering it it is really classed as a SIMS or a CMS?
Rubrics can be imported, reused, as the Moodle Docs on Advanced Grading Methods suggest. As for weighting grades across courses.... dunno, never tried it, but I suspect it would be a handy thing to know, so ...mmmm looking....