I don't know. (I'm not sure)

I want only learn english. I want academic careeer. If I learn english, I do academic career.

(I just want to learn English.  I want to have an academic career.  If I master English, I can pursue an academic career.)

I dont know

I want to  learn English. I want  to do academic careeer. If I  will learn English, I thing that  I will   do academic career.

I dont know

I only want to learn English .I want an academic career ,so if I learn English I will be able to fix it.

I Dont Know

I want only to learn English. I want an academic careeer, so if   I learn English, I will be able to have an do academic career.