With Google Forms, a basic conference form could be set up initially and your notes could be added for each student. Then, when your notes are completed, the form can be submitted and the browser refreshed to fill out a blank form for the next student. When the form is submitted, the data populates into a Google Sheet, which could then be accessed to search and sort through the data.
Toward the end of the slideshow below, I included basic examples of what this could look like with Google products. But, don't neglect to look through Sarah Taylor's slides on conferencing during Writer's Workshop.