Practice with native speakers of Mandarin as ofen as you could. Hope it helps.

I think the best way is to find a professional teacher to correct your pronunciation. I am a Chinese Teacher from Hanbridge Mandarin School. http://www.hanbridgemandarin.com/ Maybe I can help you, leave your comment if you are interested.

想知道能使中文水平更好，使发音和声调更标准的最好方法。 只有适合你的方法才是最好的，一般来说学语言可以有多种形式，看电视剧，看中文书，听中文歌都是可以提高的，重要的是你自己亲身参与，多开口练习。

如果条件允许，可以付费，找汉语口语老师。

发音和声调，最好的还是和有耐心的中国同学交谈。