when Direct Tax Code (DTC) will be implemented??

It will be implemented w.e.f. 01/04/2012. See this --   https://indiatoday.intoday.in/site/Story/117781/no-further-change-in-timing-of-dtc-implementation-mos-finance.html

You will have current Income Tax Act 1961 at least up to Nov 2012 exams.  DTC will be applicable only after Nov'2012 exams subject to its timely implementation by Govt & announcement by ICAI for its exams.

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thnx for the good work Faiz.........