When to do articleship ????????????

You can join articleship after attempt. And I dont think there is any opening or Closing date for Joining Articleship, The thing to Consider is How much period of articleship is required to give the attempt of final. 

Your Final attempt depend upon your articleship,

At least 2.5 years of articleship must be completed to write CA Final Exams..

To appear in May,2016 exams you must join articleship on or before 31st Oct,2013..

You should have join the articleship,

Now, if you join after exams your CA Final term will be delayed by 6 months...

regards,

sir 
i have cleared only group I  
is it possible to get a good firm(mediocre)
on this stage

Why Not?

You've cleared 1st group and you are eligible for articleship...

You must complete IT and OT before joining Articleship...

You can search mid -range firms wherever you want..

Go thru this link /article_trainee_corner/default.asp

regards,