Doukyuusei movie and manga "timeline"

hi ! I would like to know the doukyuusei manga time line, there's a lot of sequels and I'm afraid to be reading in the wrong order there's apparently :

"doukyuusei" 1 volume; "sotsugyousei" 2 volumes; "O.B" 2 volumes; "Blanc" which is apparently pre publishing "sora and hara" 1 volume (side story about sensei) (if some are missing please tell me)

so in which order should I read these ? also, which part/volume of the manga does the movie cover ?

I really need help there haha, hope you'll help me ! this manga/movie really has some sweetness in it and I really like it !