Make a list of the things that are unacceptable. See if you can extract out a few 'themes' that exist. Are the problems in coding; like comments and spacing

Make a list of the things that are unacceptable. See if you can extract out a few 'themes' that exist. Are the problems in coding; like comments and spacing and variable names. If so, make a check list for yourself and make sure that you correct these prior to the review. Are they design? Read up on doing design prior to writing code, and attempt to create a design up front that is more palatable to those above you. Is the problem requirements or domain knowledge? Look up "requirements engineering", there are a lot of techniques to use to assist in understanding the problem domain and the software requirements. TLDR. write down the problems, identify the root cause, make that better.