1. Resolution: scan at 300 DPI or higher;
  2. Deskew first: straighten with image correction;
  3. Remove noise: greyscale or black and white reduces shadows;
  4. Right language: pick Chinese + English for mixed pages;
  5. Handle columns: crop two-column pages per column to avoid line mixing;
  6. Choose output: editable document to keep layout, plain text if you only need words.

Proofreading

Check digits and units (0/O, 1/l) plus technical terms, and use Find to sweep easily confused characters.