I rarely use more than 1 sheet to make test strips. I cut a sheet into quarters (usually 2" strips). The first one gets 3 expsoures, 1 stop apart (usually 4-8-16). The next one is in third stops including the best full stop (usually 8-10-12 or 10-12-16), with minor adjustments to contrast (VC paper) . A 2"x8" strip is usually long enough to get the darkest shadow and lightest highlight from an 8x10 print. I use a few small magnets to hold the strip to my easel. With some practice, you can usually estimate the exposure and contrast and skip the first strip. This is easier if the whole role is exposed and developed the same.