It's easy. There takes transferring music as an instance. Just follow the below steps.
Step 1 Start Leawo iTransfer
Connect old iPad to computer via USB cable. Start Leawo iTransfer on your computer. The software will automatically recognize your device and shows iPad library in the left sidebar.
Step 2 Select music to transfer
Click the name of iPhone and go to "LIBRARY > Music" in the left sidebar and select multiple songs in the right interface by holding "Ctrl". Right click them to choose "Transfer to > My Computer".
Step 3 Transfer music from iPad to computer
In the pop-up window, chose "Save to folder" and click on "Change" to select an output directory on your computer. After that, choose "Transfer Now" to transfer music from iPad to your computer.
Step 4 Transfer music from old iPad to new iPad
Disconnect iPad but connect new iPad to your computer. Go to "iPad > LIBRARY > Music" in the left sidebar. Choose "File > Add > Add File or Add Folder" in the top middle to upload music you just transferred from old iPad to your new iPad.
For more details, check: How to Transfer Music from iPad to iPad