Hello Adithya !! I can tell you some of the strategies to crack the SSC CGL .Firstly,you need to know  what type of questions  are given and syllabus topics .And then just go through the previous years question papers to get an idea.Finish off the basics concepts of each topic,doit with concentration and set a clear time table for preparation.If you are good enough in  maths basics helps you alot,after completion of a topic give mock test ,that will let you know where you are.Make a notes while preparing it will helps you a lot.Have positive attitude and concentration while preparing.

For maths:RS Agarwal  ,its for basic concepts and Kiran's previous year book(consists of previous years papers)revise the concepts daily.

For english:English grammar and composition Rpal &p suri,Word power made easy by Norman Lewis,its for synonyms and antonyms.

For reasoning: Solving reasoning questions is easy if you do practice,just practice the papers and give mocks to get improve.

For general awareness ,take the book of Lucent and previous years kiran for GS.Make a notes while preparing ste a time for tops like 3-4 hrs ,dont stress more give some time for relaxation also.Hope i might have helped you a little bit.All the best for your exam!!!