For IBPS (Institute of Banking Personnel Selection) exams, it's typically recommended to focus on the last 3-4 months of current affairs. While it's essential to stay updated on current events and general knowledge, the most relevant information for your exam will usually come from this relatively recent timeframe.
However, it's a good idea to double-check the official IBPS notification or guidelines for the specific exam you're taking. Sometimes, they may specify the range of months from which current affairs questions will be drawn.
In general, staying well-informed about the latest happenings in the 3-4 months leading up to your exam is a wise strategy, and it will likely cover the majority of the current affairs questions you'll encounter.