Hello Panama,
Actually you posted this in the quant section. Should have posted in the verbal section. Anyways, to improve in TOEFL you should read English articles/books. Also watching movies/news etc in English helps a lot with the listening section. Plus prepping for GMAT helps a lot too.
You can start GMAT verbal prep by checking
this study plan which can serve you as a road map for the prep.
Also check
Thursdays with Ron videos which can help you a lot.
Follow
GMATninja and his posts.
And it you are looking forward to join a course, check out
e-gmat. They designed the course specially with non native speakers of English in mind and have got decent reviews. They offer free webinars during weekends which you can join and check out. If you find it helpful purchase it or look for other courses.