ya you can improve it .. i'm like you ..but i'm studying english in the university and we must take toefl test if i want to move to major ..
but i have many skills .. FIRST if you want to know many VOC and imprve the listening..
.. every day watch T.V .. and see the movies, read news paper every day...
but for speaking .. you should to speak with freind .. or chatting with any one in the messanger if you want to improve it ..
that's all ..