I've not heard if TCS has been enforcing the 6-month interval between two interviews criteria; however there are several people who've appeared for TCS interview within 6 months.

I'd recommend against it. First - if you aren't fully prepared, you'll be wasting a chance. Second, if you get selected and TCS finds out that you did not qualify; they might reject you. It's a risk that's better be avoided.

Prepare well and wait for the right opportunity. 

Thank you, Kaustubh for an informative answer

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