I suggest you recite more words step by step. Watching English programs, movies and listening to English songs will only make you more familiar with English intonation and help you find the feeling of speaking English. But after a long time, your English level will not be greatly improved, because your mind is still empty and your vocabulary has not increased. Here are my suggestions:

1, find a basic vocabulary book, insist on reciting, and be sure to write down the basic meaning;

Memorize some good words and paragraphs, so that you can have more things in your mind, just like learning Chinese in China. Write down some good sentences;

3. Read some double-translated articles several times each time, because sometimes I feel that I have understood all the English articles, but I haven't really understood the meaning;

When watching English movies, you should ask yourself questions. Don't be ok after reading them. Recall the plot and learn to describe it by yourself (this is a method taught by a foreigner).

5. Do the questions of previous years by yourself before the exam, look at the time and grasp the speed of doing the questions, not too slow.

Anyway, learning a language means having something in your head, so that the exam will not be a problem. Besides, PET3 should not be difficult, and it is similar to level 4. You must have no problem if you pass the exam.