As hard as it may be you may need to just be quiet sometimes. I totally believe in arguing your perspective but in the type of situation where it might effect your grades opt for a little give and take.
Question things, but with a little less frequency.
Does it get harder not to nearer the end of the lesson? If so, perhaps your attention span is playing a part in this (which is something I have issues with). If that is the case a calming herb like the one I mentioned, some melatonin or gaba might help with concentration.
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