Hi your post brings up several issues
Some people are not nice: All you can do about that is not let it
bother you too much.
People have problem of their own: This includes your mum. All you can
do about that is not let it bother you too much.
For whatever reasons this test is giving you a lot of problems: Is
there an alternative? Logically a driving test should be about you
ability to control a car and obey road rules and not about your
ability to use a pen and paper.
Having these problems can be frustrating this can cause one to become
emotional/tearful learning to control this may not be easy but it is
often useful
Finally it is possible to live a full and rewarding life without a
drivers license. You could always use environmental/financial reasons
for not driving.
Finally I found it very hard to learn to drive. Both my parents gave
up on teaching me how to drive. Persistence may not be a glamorous
solution but it eventually works.
Don't let this stop you having fun with the rest of your life.
Don