Simple Evaluation Metric

It seems there are three basic things that one looks for in the answers

1. Neatness (N): This involves handwriting, presentation, no erasures or bloches etc.
2. English (E): This involves how well and adequately the answer has been conveyed.
3. Subject Matter (S): This involves asking if the subject matter is correct, to the point and the clarity of arguments.

Any subject (even maths) can be evaluated on these three simple parameters. It doesn't make sense to collapse these three into one grade (even with a weighted average), as these are independent skills.

Here, N, E and S are the absolute performance metric you would measure against some standards. How ever, what you want is the change in these skills over time (how well a child has improved these three skills). Let those be n, e and s (that is n = dN/dt, e = dE/dt and s= dS/dt).

So if at-all, the marks should be given in triplets of (n, e, s) for each answer or assignment