Notification usually comes couple of months before the scheduled date of examination. Assuming that next patent agent examination will be in Jan 2012, we can expect notification in Nov-Dec. You need to keep a track of this going to patent office website (www.ipindia.nic.in).
I replied earlier to a similar question. You may refer the following link. http://www.lawyersclubindia.com/forum/Re-patent-exam-preperation-28531.asp
The bottom line is you need to have sound knowledge of Patent Act and Rules, and patent drafting. It will be extremely useful if you directly study the act and rules for paper-I. There is also a book published by LexisNexis on patent agent examination. You can Google to find details.
Hope this helps. Feel free to contact me if you require any more details.