Skype is beter,

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Practice makes perfect !

Practice makes perfect, you need to test your skills to determine your weaknesses. Begin with the most difficulties you encounter in studying. Sometimes you need to study with someone who mentions the same purpose as you do. Actually Reading expands your knowledge and writing skill, Listening betters your speaking skills. You should study 3 hours daily at least, every week test your skills. The good news here are skills will reach a higher score every phase. After all, you may need a preparation course and making a simulation before the test.

I wish I understand your purpose properly , actually you should make effective discussions in different topics both of you are interested in.Thus, divide your time in case both of you make an exchange of various languages.

You should practice the 4 skills together, read more to better your writing and listen more to better your pronunciation. Both of the two process have to be performed side by side.