There are about 125 words that make up (slightly less than) 78% of the NGSL's Top 1k words, so this is a good chance to work on expanding your vocabulary a bit.

Some good groupings and several opportunities to practise adding "THE" and "A" to the end of outlines as you are writing (without lifting your pen), round out this 60 WPM mock.

Remember outlines do not have to be 100% accurate theoretically - it is sufficient for you to be able to transcribe accurately, even though with more time, you may have written a different outline. Your memory plays an important part too.