Here I am sharing some general tips on how to plan a strategy for preparation:

• Choose the right books: NCERT books are inevitable and supple enough to clear the exam. A conceptual and basic understanding can be obtained when you read NCERT books of class 6th to 10th, especially of Science and Mathematics.

• Note Making and Previous Year Papers: One of the most important parts of preparation is to make short and factual notes, these notes will not only ease your revision but also enhance memory & retaining power. Always try to solve as many as previous year's papers at least of last 5 years and find out where you are lacking. 

• Work smartly: You must create a proper and realistic timetable so that there should be separate time slots for the different sections according to your weak and strong sections/topics. 

• Consistency: Putting the same effort every day is a rule of thumb.

• Important Tip: Develop reading habits and try to understand the application & usage of grammatical rules and improve your vocabulary by adding new words daily.

• Mock Tests: Consider various preparation sources to make your preparation stronger. Attending a Mock Test is better than reading a single topic 10 times, especially for the Aptitude section. I personally recommend you to visit the Testwale website as they are having SSC CGL Free Test Series prepared by the subject experts.

  https://www.testwale.com/test-series/5/ssc-cgl-prelims-2021/