Beginner preparing for SSC 2027 Confused about vocab & gs need Guidance

Hi everyone i am 22M, a beginner preparing for SSC 2027. I have given some mocks, and from them I realized that my maths and reasoning are strong the thing i lack is speed and some chapters in advanced maths, which i feel i can master with time. My grammar is somewhat okayish, but i think i can ace it with due practice. The subjects where i am very confused are vocabulary and gs. Someone suggested blackbook for vocab but after seeing it, it looks very overwhelming, so i would really like to know how someone who has been preparing for some time approaches this book or if there is any other resource I should study from.