The 6 most important decisions you'll ever make

I found this book in my dads collection when I was abt 12/13 after I had finished exams and was looking for something to read. And it was so insightful. I have reread it so many times and each time I read it I get a different message from it.
I keep it around with me and read it whenever I need some advice or help.
Highly recommend if you are a teen coz it gives very helpful advice in terms of school life, when dealing with parents/friends, addictions,etc

Also this is the only self help book I've read and loved (I read fiction mostly)