SSC CHSL exam is held in 3 stages (Tiers). While the first one is online the latter two are offline exams. The entire process of registration and communication happens online through the official website of SSC CHSL. Candidates must qualify each stage of the SSC CHSL exam to proceed to the next one, before being finally selected.
There are four sections in tier 1
1) Reasoning section : Just solve quizzes regularly from bankersadda and gradeup.There is no need to purchase any book.
2) Quantitative aptitude :
a) Purchase maths notes by Rakesh Yadav or S bharti notes or Math quicker.Note that you have to purchase any one of them.
b) Practice regularly from bankersadda and gradeup quizzes.
3) Gs : Complete GS capsule by adda and solve last year question papers + adda and gradeup quizzes.
Note : Don't waste much time as syllabus is infinite instead invest time on other sections.
4) English :
a) Learn one word substitution and idioms and phrases from qmath's pdf.Practice regularly from adda and gradeup quizzes.
