What are the must read magazines and articles for IAS preparation?

hope you are reading news paper religiously as you are asking about magazines. If not first go for Hindu news paper and only later place goes for magazines.

CST + Yojana + Front line only international affairs column  is enough .

All the above three magazines are available in online for free.

Pratidyoga darpan extra issues on specific topics are also good one to have like special issue on history , geography , polity etc. They are not regular but they come once in a while.

They are available in torrents, you can download from there.

PS: if you can not find any source , tell me , i will get it for you.