What if sixth subject is there?

Use Best of five tool if your board drops one paper. This one just adds what you type.

Different totals per subject?

Fine. English 80, Maths 100, still works. Dont force same total if marksheet is mixed.

Yes. Blank rows dont count. Four papers still give a percent.

Percentage

Five subject rows. One overall percent.

Fill five rows. Each row has obtained and total. Empty row is skipped. Overall is sum of obtained over sum of totals.

Formula used: overall % = (sum obtained / sum totals) × 100

This is an estimate. Your board formula may differ.

What if sixth subject is there?: Use Best of five tool if your board drops one paper. This one just adds what you type.
Different totals per subject?: Fine. English 80, Maths 100, still works. Dont force same total if marksheet is mixed.
Can I leave a row blank?: Yes. Blank rows dont count. Four papers still give a percent.