How do we select stock which is going to be volatile? i traded icici on tuesday and earned decently as the stock was volatile. But yesterday though the stock was volatile it was not as volatile as i had expected.
There is no one-and-only method of selecting which one to concentrate on today. Each person has his/her own method. How good or bad that method is can be judged by the person himself based on the earnings he is getting. So, here is what I think is any day trader should do: hunt the internet, do your research and start at some point. Then evaluate and keep upgrading. Help from peers, friends and forums like this are very welcome. You can also take help from various agencies like your brokering house or some paid site after 'due diligence'. But ultimately its your money and its your call. The buck stops there.
About your recent experience I can only say that, unlike normal delivery based trading, in day-trading it is very dangerous to get 'attached' to any one stock. You have to be professional. Take what you have got, get out and look elsewhere. Each day is new and each day has its own opportunities. What was good yesterday may not shine today. So be careful.
Like I said before, the very fact that you are asking questions like this means you are on the right path. Keep going.