Request an application package and review the application process. With regard to your portfolio, determine the institution's guidelines as to what type of work is required and acceptable. Also try to get hints on what types of submissions offer you the best chance for acceptance.
Determine the manner in which you must present your portfolio. For example, some colleges and universities require that you upload your portfolio and send it via the department's website, while others prefer a printed version. It is advisable to never send original pieces but rather, copies of these works.
Review your body of work to select pieces you believe best demonstrate your abilities and unique vision as an artist. Many colleges prefer an array of original works that help to showcase your talents in different areas, such as various schools of art, rather than works you set out to create specifically for that program.