Follow the links below and watch the videos. They get harder as you go down so do as many as you can and stop when they are getting too tricky.

https://schools.ruthmiskin.com/training/view/ezo0AnlN/PxYtdrXZ

https://schools.ruthmiskin.com/training/view/xXG39Uku/5L3Chow8

https://schools.ruthmiskin.com/training/view/77pSeQ6C/50xYVFkc

https://schools.ruthmiskin.com/training/view/ycKL9G1R/tPwSvCIH

https://schools.ruthmiskin.com/training/view/MPfQwznS/0ZZTWJDl

https://schools.ruthmiskin.com/training/view/hupxk73f/q3MWizdg