Rajesh Sharma

I believe you are asking for UPSC 2019. There are several approach to prepare but all of them are linked to one common end - Guidance. You need a good source with constant guidance. So, if somebody in your family or friend circle is preparing for the exam, you can ask them or if you don't have such support then there are two choices.

First, you can join a coaching. Second, surf the internet for 2-3 days, go through some youtube channels and if you like them then start preparing according to them.

Although, I won't prefer youtube as there are so many videos are there, you may get confused. So, try some coaching or if you are lucky to have someone in family or friends then go for it. 

It's never too late for anything in life. If your heart tells you to go for something then you must go fo it. Average prepartion time for UPSC is around 1 year with continuous and proper guidence. It may be 2 year if you don't get good guide. But, in any case, you have got plenty of time as the maximum age for UPSC is 32 years. So, don't worry about the age. If you want it , go for it