塾に入るタイミングは? https://100-trust.com/2022/01/22/%e5%a1%be%e3%81%ab%e5%85%a5%e3%82%8b%e3%82%bf%e3%82%a4%e3%83%9f%e3%83%b3%e3%82%b0%e3%81%af%ef%bc%9f/