Can I say,

(a) There are many books in / at / on the exhibition.

(b) There are many painting on the exhibition hall.

(c) There are many books in / at the books exhibition.
Original Post
(a) There are many books in/at the exhibition.

(b) There are many paintings in the exhibition hall.

(c) See (a). You can't say books exhibition; if you make a noun adjunct, the first element is normally singular, so it should be book exhibition.

However, since you've said "There are many books ...," it's redundant to repeat book. Saying exhibition should suffice.

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