Can I leave my graphs in Mathematics in pencil?
I'm always out of time by the time I reach Q16 and have terrible drawing skills, so I'd much rather not waste time doing it twice. (Pencil -> trace with pen -> erase pencil out)
It comes down to practice, really. Practice a lot and practice a variety of problems.
More practice -> Easier to see alternative approaches.
The only mindset bit is be willing to work hard and ask a lot of questions.