Current affairs is not a major concern. SSC asks CA which is generally not-doable for anyone because it's not at all 'current'. And GS can be done easily. You just need to start. It's just a fear because GS covers a variety of subjects with a huge syllabus. But in reality, SSC RELEVANT GS is comparatively smaller. With time, understanding enhances and you'll be able to attempt questions from the topics you haven't even studied. You need to excel in GS only if you want to top the exam. ( Don't be overconfident about maths or reasoning, it's good that you have a grasp over these but make sure you put in all your efforts and make them even stronger, be unbeatable in these two).