Learn Dutch: Zijn score was perfect. - His score was perfect.

You would place it right at the beginning: Zelfs zijn score was perfect. Focus adverbs like zelfs and vooral generally go directly before the word or phrase they emphasize. Since you are emphasizing zijn score, zelfs goes right in front of it.

What if I want to emphasize the word perfect using vooral (especially)?

To say "His score was especially perfect," you place vooral right before the word it highlights: Zijn score was vooral perfect. Because it emphasizes the adjective perfect, it sits directly in front of it.

Why doesn't perfect get an -e at the end here?

Adjectives only get an -e ending when they come directly before the noun they describe (like in een perfecte score). When an adjective comes after a verb like zijn (to be) to describe the subject, it always stays in its basic form without the extra -e.

Is the Dutch word score pronounced exactly like the English word?