Silk Mandarin Recommendation
I've been using Silk Mandarin for a few months now, and it has improved my Mandarin very efficiently. I was self-learning for a couple of years off and on, and it felt like language learning was taking forever. When I started my classes with Teacher YanQin, she helped me in areas I struggled with, such as Pronunciation, and I noticed I improved very quickly. If you're serious about learning Mandarin, Silk Mandarin is the program I would recommend.