Please let me know from when to when examination was held .
Please let me know from what date to till what date examination was held.
Hi, Faiz—I like the alternative Gustavo has suggested. Your first sentence does not work very well; however, the second one simply needs the addition of "and" and the deletion of "till." You can't say "to till what date."
Please let me know from what date and to what date the examination was held.
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