Quicker Maths by M Tyra- only the concepts, not the formulae. Complete it for 2 times thoroughly and marks important questions which you may forget. Revise those questions just before the exam.
Fast track Mathematics by Rajesh Verma- for higher mathematics. Learn the concepts for Ncerts and solve the questions from this book. You can opt for a different book too if you find one.
Kiran's previous years questions- This book is the most important. Solve every question. Do it twice. Mark important ones and revise before exam.
At the same time keep watching YouTube videos on SSC Maths. Practise hard to reduce your calculation time and memorise the tables first by heart. If you can do this, nothing can stop you from getting 90% marks in maths.
English
Objective English by SP Bakshi- Do the first part of this book thoroughly. Solve the practice problems given after each chapter.
Kiran’s previous years questions- After clearing your basics from SP Bakshi, attempt as many grammar questions as you can from this book.
Vocab- Memorise all the vocab from Kiran’s previous years questions. First finish this, then go for anything else. Do memorise one word substitution. They are really important and a lot of repeated questions come.
Keep reading newspapers on a daily basis if you have time. It will increase your vocab as well as improve your ability to deal with Comprehensions.
Reasoning
Kiran’s previous years questions- solve this book. If you find any problem in the concept, watch YouTube videos. This book is more than enough for reasoning.
General Studies
I am not the best person to advise you on this subject as I had prepared for UPSC so I did not study anything else. But if I did not study for civils, I would have adopted the following method.
Kiran’s previous years question - pick one question. Pick the concept on which the question is asked. Cross check that concept from lucent or any other book. Read it. Pick the second question and do the same.
Leave those questions which are really tough to handle or those questions on which you are not able to get any information from any book.
Unlike as the UPSC, SSC doesn't want deep knowledge and your expertise in anything. Most the questions are direct not brainstorming. So the Mantra of SSC is practice and alot practice and then practice with revision.
Tier 1 : 100 questions were asked from GK, Maths, Reasoning and English (25 from each section)
For General Awareness : Lucentis more than enough. But if time is less or you don't wanna spend so much time on gk then go for arihant publication gk by manohar Pandey. But these two books must be complemented withkirans 10000+ questions on general awareness.
2. For English : There is no need to refer so many books.
Just getPlinth To Paramountby Neetu Singh(made for SSC CGL). Read it two to three times.
If you want go beyond the SSC CGL then go for S.P.Bakshi.
3. For Logical Reasoning : This part of the paper requires great reflex at the examination hall. There is no need to put much efforts in this part. Just follow some of the topics in which you are weak. Install the app like Gradeup and solve reasoning when you are idle.
Logical Reasoning By R.S Agarwal is sufficient material to follow.
4. Maths : Rakesh Yadav Class Notes is perfect but the short tricks mentioned in the book is not easy to grasp if one has not attended his classrooms. But the quality of questions is good. Follow Rakesh Yadav Sir Youtube Lectures which is available for few chapters.
For solving more questions purchaseKD Publications Arithmetic book and Advance Maths.