Learn English – What would you call a person who does a job but doesnt really care about quality of his work

Although I would have to agree with both snailboat and hjpotter92's choice of eidetic and mnemonist as words meaning "someone who is very good at remembering", it really isn't particularly idiomatic. Most native speakers would say:

John has a photographic memory.

Rather than

John is eidetic.

And

Jill has a good memory

Rather than

Jill is a mnemonist.

In general, as a native speaker I would prefer terms that are widely understood and in common usage rather than ones which are concise, so unless you have particularly good reason to expect the person you're talking to to know the term eidetic, I'd probably just stick with something similar to the following:

Jane has amazing memory prowess.

John's memory is fantastic.

Bill has a surprisingly good memory.

The usual term when I was in school was scratch paper—scraps of paper you "scratch out" calculations and notes on, to be discarded after results have been fair-copied into your exam answer or essay.

• Laure calls my attention to scrap paper, which appears from this GoogleNGram almost always to have been more popular in BrE, and to have become more popular in AmE since I left high school.

• Jim calls my attention to the alternative term work sheet. This works, too; but in my experience it is usually employed when you are supposed to turn in the paper, with your exam, rather than discarding it.

A working paper is usually either a) a report on a "work-in-progress" or b) a "working" version of a paper which is still in development and not yet ready for submission or publication.

The traditional term in textual criticism for an author's manuscript draft, often full of strikethroughs, insertions and corrections, is foul papers, from which a "clean" version or fair copy is made.