there's no quick way to master playing both hands. However, to master it faster, you can try playing harder songs like grade 3 for a starter. Gradually, you will feel generally pop songs will be easier to play. Then slowly shift to grade 5 songs n lastly whatever hard songs lo.

The key is always practise and buy a book that helps u train your fingers. i got a book that has plenty of exercies on fingers coordination. Unfortunately, the book isn't with me now. So can't tell u d title n author. ANyway, gud luck