You can do these on training mode (Practice tool). Go to in-game graphics options and make sure the settings are as follows.
If you have a good PC, you can increase the settings slightly. These High Performance graphics settings are for PCs which close to the minimum system requirements. You can skip this step if you don’t want to change graphics settings.
17) Reduce Ping and Fix Lag System Requirements for Running League of Legends Minimum System Requirements Recommended System Requirements CPU 3 GHz processor 3 GHz dual-core processor GPU Shader version 2.0b-capable video card Nvidia GeForce 8800/AMD Radeon HD 5670 or equivalent video card DirectX DirectX v9.0c or better DirectX v9.0c or better RAM 2 GB RAM 4 GB RAM Storage 12 GB available space 16 GB available space OS Windows 7, Windows 8, or Windows 10 Windows 7, Windows 8.1, or Windows 10 with the latest service pack installed 1) Best Graphics Settings for LOL