Practicing whiteboard-style interview coding problems is very helpful. The best places to work will all make you code in the interview [1] so you want to feel at-ease in that environment. If you want to do a practice interview I'd be up for doing that and giving you an honest evaluation of whether I'd hire you if I were hiring.

[1] Be very cautious about somewhere that doesn't make you code in the interview: you might end up working with a lot of people who can't really code.