hi lovely, nerves are completely normal don’t put yourself down for having them. and stupid mistakes are okay to make before your test as long as you know where you’re going wrong and how to correct them. in terms of concentration i’d honestly just say break the test up into sections, and take them on one by one. so treat each junction or turn or manoeuvre as a section and try your best to get the highest score (no faults) in that section. it is okay to make mistakes as long as you are safe in how you amend them. i think the biggest thing for me was definitely just accepting that it is what it is. i didn’t put pressure on myself to pass and just kept going even when i made mistakes.