Hello dear,
There is no proper place where you can find them because the papers available are based on memory of students.becuz bits can't publish the entrance papers publicly.

BITSAT 2018 exam will be conducted from may 16 to may 31... applications for admission with 12 preferences and references had been started from may 1..
Check out shiksha.com for more information..I have placed the link below  https://www.shiksha.com/university/birla-institute-of-technology-and-science/exams/bitsat/dates

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