I don't see a New Delhi office listed on the Mercury site, but that does NOT mean there isn't one. Check out the link to your left and send a note to them and see if there is any training there on WinRunner.
If not, you're STILL in the right place Look at the top of your screen right here and click on the Training tab. BetaSoft has a great training program at a very reasonable cost.
Silk Test I personally can't help with, but drop by the Silk forum and someone there is bound to have an answer. Good luck