Can I give the actuarial sciences exam papers side-by-side while doing B. SC or B. Tech
Yes, you may give your acturial sciences exam simultaneously while doing your undergrad programme like B.Sc/B.Tech etc.
Check 2. in the FAQs of ACET in the below link
http://www.actuariesindia.org/subMenu.aspx?id=383&val=Frequently_Asked_Questions