this year there is strong possibility that mains examination pattern will be changed hence the delay.also it doesn't matter if the pattern changes or not if you had not started your preparations at least 5-6 months ago including coaching for GS/optionals.i.e.~sept/oct last year.if you are good in english & average in GS then with 2-3 months preparation you may clear pre but to clear mains you need at least 1-1.5 years of preparation not to mention hard work & dedication.it is after all the toughest exam in India.