I guess it doesn't matter if you put it in this chapter or the next... as long as you don't forget it
Nut I have to admit I'd really like to see how Ranko's school life will be. I hope that you'll write a lot about Ranko's school life and not just a few short paragraphs. It could be interesting.
And that's the bottom line 'cause Dumbledork said so.
Considering Ranma was still barely passing in High School with all those attacks and sleeping in most classes Ranko is likely to be seen as a child prodigy. After all she's back in Primary school again.
Although given Ranma's Training trip she might need all of these basics that were missed while on the road with Genma. You have allot of lee way here. Because in effect these school years are things most likely missed in the past reality.