BITS Pilani offers a direct admit to only those student who are an overall topper of their respective boards, or only one student (who is the topper according to the board). So, if your board has declared you to be the 5th ranker, then even if you become 1st after removing languages, then BITS Pilani won't offer you a direct admit. If your board had declared you to be 1st, then you would have gotten the offer.

Hope I have answered your question. All the best!