I am listing down some points where you can focus more

Geography and Economics:

Here, you need to focus on physical and Indian Geography.

No necessity of going through world geography .

Questions are also asked from economy but very few.

Refer NCERT of Geography from class 7th to 10th and economics book of 11th class only.

You can refer Lucent and Previous Years Questions which will help you in this section

Science:

35 – 40% of SSC CGL questions are science based questions.

Follow basic NCERT science books from 7th to 10th class.

You can start Solve Previous Years Questions Papers.

Also refer to Lucent General Science Book

Current Affairs

Current affairs is the most dynamic topic.

To boost your current affairs part, go through newspapers on a daily basis.

Go through important information like names of people and places in news, names of receivers of various awards etc.

Keep an eye on the national BUDGET regularly.

Hope you find it helpful

let me know in the comment box if you are having any further doubts

thanks

Good Luck!