498a:chances of conviction

As she has filed a case after sucha long time if the judge has not been bribed then there is only going to be one outcome your aquittal. As complaint should be filed withi 24 hours of offence committed and here its different scenario. It all also depends what proofs has she produced before court i dont think she might have been able to produce any and if it is so then just relax mostly judges know that its todays business of many woman to marry and the earn money through such stupid laws made by man to screw a man. Just remember try to get divorce when you get aquitted which i hope you will on the grounds of adultry thoug it is difficult to prove so that when you file for divorce your wife should not be able to claim heavy compensation and i believe you wot be interested in staying with your wife any more.

It is not very clear whether it is the girl's evidence is what your are talking about or accused's examination u/s 313 CrPC after prosecution evidence is over. In the First case as Ld.Ashish said you'd get a chance to demolish her testimony by crossing her. In the former - it is for you to lead defence evidence now. 

Whether this case would lead to conviction or acquittal can't be said without looking at the entire material. 

If have evidence that ur wife left u and turned out to her parental house with out a valid reason and filed a case after long delay go for quash the complaint before the examination.

Good luck