Many doubts about articleship

accounts exam may 2015...smiley i hav cleared guys...though its jus grp 1 of ca ipcc..i feel very relaxed bcoz its my 6th attempt...every tym i write ,analyse and feel i will clear in this attempt...i have actually lost it many times with a narrow margin in achieving aggregate or so..i have written both groups n even tried writing single group alone..nthng worked earlier...cried ,devasted,frustrated,depressed...what not...every negativity took over me...ok..enough of my failure story.. i jus wanted to ask about gud firms which take me for articles in chennai or banglore aftr my result i.e, 1st grp n 6 attempts.... any chance of getting into big 4 if i have a reference???n what should be my preparation for joining articleship anywhere?? and by when should i join???or which one is gud for me -to join in big firms or mid sized firms for my final coaching and all other stuff???? so may questions in one post bt pleeeeaaaaaseeee help me out....