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Opportunity in both the fields are enormous and totally depend on in depth knowledge you gain in your field in the engineering time span. So don't compare, just follow your interest and you will do fine. There are plenty of jobs in both fields for people who do well, and there's a very wide array of applications in both fields. If you like working in the open and love designing and drawing choose civil. But if you want to work in an AC room sitting on a chair in front of a PC choose computer. Computer science is comfortable branch and has more scope especially onsite opportunities.
Computer Science- branch with a high scope for campus placement especially if you see yourself in Infosys, Wipro or other CS/IT company. If you love roaming around your PC and had an interest to have insider knowledge and software development then CS/IT is the right choice. The job demand for civil engineers is also a lot more spread out. Every single city is going to have building permits/inspectors, and every contractor will eventually need an engineer's report. In that regard, a civil engineers income after expenses, can actually outpace a software developers in a lot of areas. Ultimately though, it's what a person enjoys doing more. Neither is a bad plan.
Civil- Relatively easier with a high scope of government as well as private sector in India as India requires design infrastructure and civil will be in high demand so long as infrastructure exists. I should say too that sometimes these two fields intersect and likely will intersect more in the future.

There is no requirement of special books of PCM for CET preparation as the syllabus is similar to the other Indian engineering entrance examinations. Therefore, one can follow any standard book for engineering preparation available in the market. But I would suggest to build a strong foundation of concepts of PCM as it will help you in the long run. Moreover for the General Aptitude, English and General Knowledge there are plenty of good books available in the market. You may pick RS Aggarwal, General English by Arihant or any other as per your convenience for the first two sections. Please keep in mind that in these sections also the syllabus remains more or less same for any competitive exam e. g. SSC Bank PO etc., so, it depends on the student, how one prepares.