online

Yes, choice filling in IPU for B.Tech is an online process.
It will start immediately after all registration will be done.
I think, choice filling will be done after 22nd June, as of new notice came on IPU's website

No, AICTE has banned any engineering program other than a full time on campus degree program and even if somebody offers such programme it is invalid and unrecognized and most probably a fake one. You may still check for BITS-Pilani work integrated learning programme which is very costly but you may face recognition issue later. If you are a Diploma engineering holder or a 10+2 with physics, chemistry or mathematics, you may still opt for AMIE but that won't be accepted everywhere and one of the toughest exam in the world.

Yes, what queries do you have regarding the affidavit?

You can re-download the form from UPSEE official website, it will ask you some details, provide that so that you can get the form again, no worries.

Don't go for online mode if you are seriously looking for a career in HR. Take proper classroom training as companies would be more interested in classroom training rather than the online mode.

You have to fill the programme you wish to apply for after checking the eligibility, there might be some deductions in marks for changing the stream when calculating the best four. So you fill the BA programme in online application and at the time of counselling yours marks will be calculated after deducting.