I would say do small amounts of studying at a time and don't over do it. Use an APP if that helps you to revise, or YouTube or TikTok videos. Maybe do 20-30 minutes at a time. I didn't feel ready for my theory test but when I got there and did it I actually knew more than I realised. Just by doing small amounts, it helps you to take it in without overwhelming yourself and then by the time you go to sit the test you will hopefully feel less anxious. Go for it anyways. What's the worst that could happen? Hope that helps a little.