Hi

Yes, you can definitely choose a different category irrespective of the category choosed by you this year  in your SSC CHSL application form next year provided you must have relevant certificate for the same as if you choose any category like OBC sc or St category then you will have to upload the  certificate for the same.

Also,

To prepare well you can follow the below tips :-

First of all go through its syllabus at:-

https://competition.careers360.com/articles/ssc-chsl-syllabus

The list of  best books that you can use to cover your SSC ChsL syllabus are listed below

QUANTITATIVE APTITUDE

*Elementary & Advanced Mathematics: Kiran Prakashan

*Advance maths for General Competitions: Rakesh Yadav/KD Publications

GENERAL INTELLIGENCE & REASONING

*Verbal and non-verbal reasoning: R. S. Aggarwal

*Analytical Reasoning: M. K. Pandey

GENERAL AWARENESS

*General Knowledge: Dr Binary Karn /Lucent

*Manorama Yearbook

*Also read newspaper for current affairs

ENGLISH COMPREHENSION

*a mirror of Common Errors: Dr Ashok Kumar /Academic and test publication

*Competitive General English: Kiran Prakashan

*Objective General English: S. P. Bakshi

* make a routine, and strictly follow it ,give more time to your weak areas in your routine . Routine will be very helpful for you as it will help you to study in a systematic way and avoid wastage of time and procrastination

* Prepare short notes :- you should prepare subjectwise short notes , it will help you a lot during your revision for your exam

* Revise :- the syllabus of SSC ChsL is wide so revision is must otherwise you may not be able to recall  what all you have studied during your exam

*Practice mock test papers:- it will help you to understand the examination pattern, types and difficulty level  of questions which are asked in exam,  you will also get to know your preparation level and then can work on your weak areas to perform well in your examination.

For more tips visit

https://competition.careers360.com/articles/how-to-prepare-for-ssc-chsl

Thank you