Ca final

There isn’t any time gap requirement to be fulfilled.
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As you have passed CA-IPC and completed 2.5 years of articled training, you can give the CA Final exams in May’15. For that, get registered for final level at the earliest and then fill the exam form as a provisional candidate.
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You may read the eligibility criteria for final exams at https://icaiexam.icai.org/guide_final.php (refer to para 4).