I always found English study difficult until I figured out how to overcome the difficulties.First of all,you have to be persistent and patient when you study English.You should make a long term plan and stick to it everyday.For the vocabulary,it's better to keep reading and writing the words and try to put them into sentences.For reading and speaking,I recommend to read English newspaper everyday and try to make as many conversations as possible with your English learning partner.If you don't have a partner,it's never too late to start to find one.
I hope this paragraph helps.