B.Arch

Hello,
Eligibility for IAS is passed graduation in any discipline from a recognised university, there's no minimum aggregate required in this case, you need to be 21 years old and you can apply even in the final year. Now, coming to your question UPSC is more humanities oriented and people from humanities background have an added advantage they're already well acquainted with the subjects included in the syllabus, for Science and other streams they do not study humanities subject at 10+2 and graduation level. But, this in no way mean that people from other disciplines cannot qualify this exam, if we see the previous year trends those from engineering, medical background and alike have qualified UPSC, in fact this is also a very reason that UPSC doesn't discriminate among aspirants and hence allow people from diverse background to appear for the exam, so there's no reason why you shouldn't with B.Arch Degree
Eventually, what matters is your preparation and strategy, UPSC takes two year; one year for preparation and another one for appearing for three stages namely Preliminary, Mains and Interview. This exam tests perseverance like no other exam, and if you're determined and focused, you'll definitely qualify this.

Hi
Yes, every university and college have provided the option of branch change, for the students after passing first year, so that if any doubt still prevails in the mind of a student after taking admission in first year, he/she can then change his/her respective branch in second year. You need to check your interest and also the suitability of the entrance in to the world of architecture as you must have not given the NATA test. Log in to some good sites like LPU a university of repute in both the fields of CSE and architecture and check if you meet the requirements of the shifting of these two streams. Browse some good websites and take details of transfers from the help line also. Hope this will be a help!

Good afternoon, Mayank!
I would recommend Chandigarh University for B.Arch as Chandigarh University provide their students with more practical knowledge along with theoretical part so they learn the importance of its practical impact in reality. The University offers 100% opportunity to its every student to avail good jobs from their internship programs. The students go on regular industry visits so that they get to face the complexity of the industries before stepping into the professional world. The experienced and well qualified faculty members help their students with the best to work on their professional portfolios. Hence, Chandigarh University is a better option.