@kanika488 Cornell’s Bachelor OF Architecture program is very selective (even more so than the university as a whole) and the portfolio weighs heavily in admissions. The school of architecture website lays out portfolio requirements, which are extensive.
The portfolio should demonstrate creativity, design presentation and a facility with several media, especially drawing. It does not have to include examples of architecture. You may be able to put together a reasonable portfolio in the next few months, but without recent art classes I think it will be difficult.
You might consider some BArch programs that do not require a portfolio (though in some cases the portfolio is recommended). For example: Auburn, UArizona, Cal Tech SLO, IIT, Penn State, Notre Dame.
You might also consider getting a Bachelor of Science or Art IN architecture, followed by a Master of Architecture. Some BS/BA programs require a portfolio, but most do not. The combination of the BS/BA + MArch is common in the US and Canada. A few examples of strong programs are WUSTL, Northeastern, UVA, UMich, UCincinnati. There are many others. (You’ll need to check the portfolio requirements.)
You can be admitted to an MArch program with a BS/BA in architecture – in art, in design, or anything else, really – as long as you fulfill the MArch admissions requirements. Requirements vary but usually include some level of art studio, art history, calculus, physics plus a portfolio.