Can I use a number 2.5 pencil instead of 2 for standardized test that is scored by computer?

No, you generally cannot use a #2.5 pencil on standardized tests scored by computer. Most, if not all, standardized tests specifically require #2 pencils. The computer-scoring systems are calibrated for the graphite density of a #2 pencil. A #2.5 pencil might be too dark, causing problems with the scanning equipment and potentially leading to inaccurate scoring. It's best to stick to the explicitly stated requirements to avoid any issues.