Hi Ezra
Grade 1 aural is really pretty straight forward. It's really just testing if you can listen and then repeat or describe what you hear.
So, the examiner plays some music and, in test one, you start clapping the main beat (pulse) in the bar. You need to identify if it's in 2 or 3 beats per bar. You can get started on this by trying to tap the beat for any music you hear on TV, radio ... anywhere. Identifying the time is a bit harder but, basically, if it seems like a march or you can move your feet (left, right, left right etc) evenly, it's probably two. If it sounds more like a dance (waltz etc) it's three.
Singing back the echoes: each is very short. Again, try singing back just a bar of a tune you've heard. The tests are not long at Grade 1.
The most difficult test is working out the difference in the rhythm. My students can hear the change usually but do struggle to explain what's happened. I think, so long as you can give some description what happened (ie you made the first note longer) you'll be on the way to getting through this section.
Listening out for features in music, the final test, is again easily rehearsed by thinking about music you are listening too. At Grade 1 you've only got to spot two aspects of the music (loud/soft and smooth/detached).
I'm not sure if you have a teacher? They should be able to help you with these tests. I'm not sure if it's available across the world but lots of people recommend
http://www.hofnote.co.uk/ to help people prepare for their tests.
Whatever, don't panic. Have a look at the assessment criteria
here and you will see that you don't have to get everything right to get reasonable marks. Start working on these well ahead of taking your Grade 1 and I'm sure you'll be fine.
Good Luck!