I think it's been pretty accurate. It has also been a while since I read this section of the novel so maybe small details got jumped over but all the major points and the character development so far has been spot on.
Lucas is just as shit as the novel.
Art is just as badass.
Sylvie is just as cute.
That's why I don't have high hopes for how much I'm gonna end up liking webtoon Tess since I hated her in the novel.

School arc worst arc here we come!
*This is just my opinion. A lot of people hate war arc more so whatever