Please use FileSystem tools to finish the following task:

### Task Description

Classify all files in the test directory into three categories based on their file size. Create three subdirectories and move files accordingly.

### Task Objectives

1. **Create three directories** in the test directory:

   - `small_files/` - for files smaller than 300 bytes
   - `medium_files/` - for files between 300-700 bytes (inclusive)
   - `large_files/` - for files larger than 700 bytes
2. **Move all files** from the test directory into the appropriate subdirectory based on their size
3. **Handle all file types** - classify all files regardless of their extension (.txt, .jpg, .MOV, etc.)
