Remember one thing content is important and not the book. So you either go with RD Sharma maths bolke or RS AGGARWAL for reasoning book or watch as many as videos you can of subtopics of mathematics but just keep one aim that you clear you concepts and become confident for exam. To improve your English and grammar, watch some English videos and movies and try to learn new vocabulary and use it in your daily language. For computer awareness and quantitative ability, watch and read as many as videos and lectures available, clear your concepts and then solve as much as you can.

Best wishes. Thank you.