Article: This will depend on what your situation is. For example, if you did poorly on a single assignment, ask to redo it for partial credit. However, if you have a C- in the class and want to have it raised to an A- just by redoing a few assignments, your teacher will most likely say no; instead, offer to do a lot of extra credit to prove how motivated you are. It might not shoot your grade up to an A, but it'll certainly help. Instead of just doing your homework, highlight important parts and write neatly, and especially make sure that everything is legible and it doesn't look like it got mangled with by a prizefighter. This may add a few extra points, since many teachers count neatness as part of your homework grade. If you are turning in a report, it may be helpful to purchase a report cover to further demonstrate your care for your final product. Consider trying to mark someone's work whose handwriting is all but impossible to read. Think about how much extra time this must take. Sometimes opportunities for extra credit will not be so obvious, so it's important to be on the lookout and to be visibly keen. Teachers will be impressed by someone going the extra mile. Not only will you score extra credit marks, but you can make a lasting good impression on your teacher. If any of these things seem unlikely to work on your teacher, don't try them. It will be a disaster. Follow steps you're comfortable with and change/skip those you aren't. You know your teacher best, and, believe it or not, they know you too. Although extra credit can be extremely helpful, it's not meant to make up for your faults. Extra credit is designed to help bring students who have been trying in the past to further bring their grades up. It's unlikely that a teacher will assign enough extra credit to change an F to an A.

What is a summary?
Think of a solution that seems reasonable. Maintain your high level. Be proactive and look for extra credit. Keep your expectations reasonable.