Cds exam me current affair kitne purani aate hai

You can prepare for last six months current affairs, you can refer to websites providing these notes on daily basis, or better if you read newspaper like The Hindu, The Indian Express on a daily basis, if you maintain this routine regularly, it'll be good from the point of view of exam preparation.

You can refer to magazines as well, like Pradiyogita Darpan, it provides a lot of information catering to different aspects.

There are also number of youtube channels, providing your daily doses of current affairs.

The best I can say is getting the information from newspaper, since what happens is that websites or magazines compile a lot of information, there are also chances of missing out on something.

Reading newspaper helps you maintaining regularity knowing all the happenings which covers all aspects of news like economic, political, science and technology etc.