Related to the previous post with model answers to IELTS Parts 2 and 3 on the topic of Stars and Planets, here is a video with vocabulary and phrases that I used.
I suggest using a dictionary for new words. Practice repeating the words and phrases for pronunciation practice. And, listen again over the model to hear them in context.
Try recording your own original responses with an audio recorder. Listen to your recording, and take note of your speed and pronunciation.