Printing numbers and letters correctly is difficult for many children. Reversing numbers and letters is very common, especially in grade one. It takes lots of practice! Here are two videos which might help.
Writing Numbers: https://safeYouTube.net/w/KYu4
Writing lowercase (small) letters: https://safeYouTube.net/w/tZu4
Practice writing numbers in fun ways: tracing over letters with a highlighter, printing outside with sidewalk chalk, printing inside with flour sprinkled on a countertop (or with pudding!)