should i buy a car? Help me?

I have spent a significant amount on driving lesson, and I still get super nervous during the driving test. I have failed it twice. I don't have anyone with a car that can help me practice during my spare time, but I can't keep spending my hard earned money on lessons to master the small details....I am considering buying a car now(i know someone who is license and can legally accompany me,) and practicing all I can. I can drive, but I need way more practice to get rid of the nervousness. I have already taken more than 30hours of proffesional classes by the way. So what do you think? Thanks in advance!