Hello,

There is no such restriction in terms of graduation subject when it comes to UPSC exam, as its eligibility criteria states passed Bachelor's Degree in any discipline from a recognized university, and to further corroborate this point people from diverse backgrounds appear for this exams such as engineering, medical, commerce etc, the planning, preparation, dedication, and single-minded focus remains the same for every aspirant, if you aren't so sure of having a career in government service specifically speaking UPSC, then it's good to have a back up plan, there are many people who qualify this exam even while working, of course one rule doesn't apply to all, it depends on individuals, their capacity, priority, time management skills, but then nothing is impossible, another important thing you have to remember is the preparation process will take one year and you'll be giving exams of three stages in another year, so it basically spans over two year of your life, the process isn't as quick as say perhaps in case of bank recruitment which usually gets done within a span of few months or a year, so think through it all and then take a decision accordingly, IAS is not only one of the most coveted position in government service, it comes only after one has put in enough dedication, focus, diligence as you must be well be aware of the humongous syllabus it has, also you need to have an inherent inclination towards learning about your country in every manner, for instance if  you don't like humanities subject like economics, history, polity etc it'll be very hard to deal with the exam, you have to enjoy the process as there will be tough moments that  you have to sail through, this exam tests perseverance like no other exam.

Hey student.

Hope you are doing well. So basically the first question which arises is are you really interested in doing B.arch, because the bachelor degrees related to engineering specially have a very hectic schedule, including internals, practicals, various cultural fests, externals and many more. Also it kills time. So if you aspire to be an IAS then you can look for bachelors in political science it will help you in studying as well, or you can study by dropping at home.

Have a great future ahead.

Good luck!!