Which is the best source of current events for upsc prelim apart from the newspapers?

Some good sources from prelims perspective include:-

1. InsightonIndia website:- Their current events section and daily current event quiz are really very helpful
2. Civilsdaily :- Its a website which summarise daily current events and is helpful if you want to see factual info is less time consuming way.
3. Monthly Magazine - Vision, Vajiram,IAS baba to name a few. I liked Vajiram from prelims point of view and vision ias from mains perspective. Not much diff so one can choose any.
4. Some publications even sell MCQ bank on current events, that can be seen as well if you need.