High Tech 35 Exercises for the Violin or Viola

In this book, I've gathered a lot of the virtuosos's numerous secrets of Paganini. So, it can be seen as the key to the secrets of Paganini. In order to master the mysterious techniques in the High Tech 35, you should practice the pictures of 'finger flexibility method' in the second half of the book every day. If you search on YouTube, 'Eun Hwan Bai, High Tech Exercise', you can see a lot of related clips. When you try these techniques at first, it is very hard, but if you keep trying with patience, eventually you can learn great techniques.