Here are some different ways to write this. 

My next English exam

Dear friends,

I am a little nervous because I have my next Ensglish exam.

I need someone who can help me, above all, I need practise speaking.

The issues I should/need to talk it's about are:

national envirommental concerns.
personal values
public figures
society and living standards
the world of work
unexplained phenomena.

I need to learn vocabulary. Although/Even though I memorise it, when I am speaking I can't remember!

Is there someone who can help me? 

xxx

I am happy to help you if you need. 

My next English exam

Dear friends, 

I am a bit nervous because I have my next English exam coming up soon.

I need fo find someone who can help me, above all, I need to practise speaking.

The issues I have to/ need to talk about are:

National envirommental concerns.
Personal values
Public figures
Society and living standards
The world of work
Unexplained phenomena.

I need to learn vocabulary. Even though I memorise it, when I am speaking I can't remember it!

Someone who Can someone help me?

xxx

If you need a hand just send me a message - Saludos - Don't stress out you'll be fine!