It is best to say: I want to practice speaking. I want to practice my conversational skills. "Wanna" is very informal, and isn't used in an academic setting, because it isn't a grammatically correct word. It doesn't exist in an English dictionary. "Want" is better, because it is grammatically correct English. Even better is the phrase "would like". It's more polite and used more in an academic setting. I would like to practice speaking. I would like to practice speaking English. I would like to practice my conversational skills.

Hi Nina, I suggest that you look at this site http://www.italki.com/knowledge/contribution-Spoken+English.htm

We can write wanna or gonna BUT it is not grammatically correct, it is used commonly but, this does not mean that is correct to use it. It will be a mistake of my students if they write wanna or gonna in my tests, sorry but one thing is the use of a word another very different is if the word is grammatically correct. Also, if you want to speak English the most correct way possible you should not use these kind of language.

@Katrina, The word "wanna" does exist in some English dictionaries such as the one that I'm using. Some people use the word to mean 'want to' or 'want a', which is not to be considered correct. But, we can write this form when we are copying somebody's speech!. This is what 'my' dictionary says! :) want = would like ('d like) Both express want and desire.

@Teresa, 'Wanna' is informal, non-standard. We all know that it is the written form of the word some people use to mean 'want to' or 'want a', which is not to be considered correct. However, we can write this form when we are copying somebody's speech!! Anyway, I'll retype my answer;) - I want to practice speaking English. - I want to practice my spoken English. - I want to practice My English speaking skill. - I want to practice my spoken English. - I want to practice my oral English. - I want to practice English conversation :)