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You can only begin preparing for CA, once you begin with your 11th grade (I am assuming you will opt for commerce stream).
You need to focus on your 10th standard subjects as of now as there is hardly anything you can prepare in 10th standard that is going to help you in your CA exams (except maybe a little bit compound interest, simple interest).
While you are in your 11th and 12th grade, you need to just put in some extra effort in certain subjects that will further help you sail through CA common proficiency test (CPT). This is considering the fact that there is a change in examination pattern from objective to subjective.
In 11th grade, just keep your basics clear about subjects like accounts, statistics, mathematics and economics.
In 12th grade, you are required to put more emphasis on certain subjects namely accounts, economics (Micro+Macro) and mathematics (calculus). If you do have time to spare, you can go through the basics of Indian Contract Act. Lastly, do not forget about class 12th exams and devote time accordingly.
After you are done with class 12th exams, you have 3 months before your CPT exam (give or take a week). You just need to plan a routine for those 3 months and you will get through.

UIET Chandigarh is quite good in comparison with many other colleges. It has been developing decently over the past years. It is backed by some good faculty, decent placement record, the stature of being engineering department of world famous university i.e Panjab University. CSE and IT being the most demanded job fields, enjoy the status of being the best branches of the college. Various companies like Infosys, Gemini Solutions, Unisys, Jugnoo etc have been visiting the campus for placements.
You will find various opportunities in UIET as well as in PU for your all round development. To foster co curricular activities, we have various clubs likeUtechnos Technical Committee,CodeChef Campus Chapter - UIET, PU,Entrepreneurship Development Cell,OSMIUM-The Theatre Group,Google Groupspulug , Brand Promotion CommitteeUIET PUand many more.
Apart from academics,UIET also has its annual cultural and technical festGoonj UIET, annual E-SummitUdyami EDC, Panjab University, event to spread FOSS awarenessSoftware Freedom Day - PULUG, Chandigarhand many more fests and events of PU.
PS- It may not be the best but is a fairly good institute.