The codes are like this:
Count how many mark entries (max. = 7, min. = 1). If more than 4, count best 5. If equal to or fewer than 4, count the total (if 4 entries, count best 4; 3, count best 3 ...)
"Count best 5" means to sum the best 5 mark entries.


Is there any way to simplify the codes?

An expression ike
IF(COUNT(C1:I1)=4,SUM(LARGE(C1:I1,{1,2,3,4} means there are only 4 numbers in the range, so, why the LARGE function?
As I understand it

=IF(count(C1:I1)>=5,sum(large(C1:I1,{1,2,3,4,5})), sum(c1:I1))

should do?

(entered as array of course)

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@Pecoflyer #2

{1,2,3,4,5}, {1,2,3,4}, {1,2,3}...

Why? It is to cater for the case where there are only 4, 3, 2 or even 1 numbers (not 5).

But now your expression appears to be more precise. Thanks for your idea, which inspires me to how to make codes simpler.