Cancel vs Try Anyway? (Lit too hard...)

<p>Hi guys,
I am taking the Literature, Math II and Physics SAT subject tests this saturday, but I don't think I will do too well on Literature. Should I just cancel and not write it? OR should I write it anyway and see what develops?</p>

<p>More specifically, when I send these scores, would it be mandatory to send ALL my subject test scores? If it is, then I'd rather cancel literature I suppose...</p>