In my opinion, learning to speak at school is a great way to develop my speaking skills.
Firstly, at school, we have teachers. They will correct our mistakes, helping you give the best improvements to your speaking. Secondly, you can practice speaking English with your friends and classmates. It helps you build your confidence in communications. You and your friends can also correct each other's mistakes. Thirdly, learning to speak has many different ways, such as: watching English programs, films or a movie, watching TED talk,... It's up to you. But talking to your teachers, your friends is a truly practical way to improve. It’s the basis of dealing with your speaking tests.
In conclusion, it's not difficult to learn to speak at school, so why you shouldn't try it?