Civil services Examination preparation is a long-term planning and your query shows seriousness towards your goal.
As such, General Studies syllabus encompass vast range of subjects/topics from diverse disciplines and for an effective preparation, you need to go for self-assessment. This step will help you in realizing strengths and weaknesses and accordingly, you can plan your studies by prioritizing your needs.
Have a look at the syllabus and previous years’ question papers to understand the level and examiners’ expectations.
The current trends clearly indicate examination desires conceptual clarity as well as alacrity about current developments and contemporary developments. So, you should plan it effectively and you have time at your side for doing that.
Make a beginning, and as you move, you will keep on getting insights that will guide your actions.
All the best!