the key to the reading part is having good vocabulary ,you can enhance yours by:
1- studing books like ( 400 must have words for the TOEFL test ),even you find it difficult, trust me,its very helpful.
2-Also you can read newspapers, scientific magazines which have similar articles to what we find in the test. try to guess the meaning of the difficult words ,then grab your dictionary and see if you were right.
3-write the words you learned in its actual sentences in your notebook, because of course everyword may have more than 1 meaning,also it's more easier to study and memorize .