It depends. If you’re using an F horn, then you should focus on practising passages exclusively made for it for a longer amount of time compared to if you’re using a double horn. You can also try drone practice, which helps develop your inner ear and overall musicality. This can also be useful for mastering scales and lyrical passages. And lastly, practise using different vowel sounds to achieve better accuracy. Or you could whistle so you get the feel of various tongue positions and vowel sounds. To find out more about practicing the French horn and improving your French Horn technique you can check out our dedicated articles in this beginner's guide.