1. She never was entirely sure what sort of relationship she had with the Doctor, but she knew perfectly well that whatever it was couldn't last.
2. She could have passed her A-levels easily, but she got distracted by a crush on - going on obsession with - her chemistry teacher. In later life she was so embarrassed by this that it was easier to tell herself she was just rubbish at science, and a bit of a duffer generally. Her clumsiness helped convince herself of it, and it was only in her time with the Doctor that she began to realise there was more to herself than that.
3. She was profoundly disappointed that Cliff got involved with industry, but when he called her on it, and told her that it was no good spending all your time keeping your hands clean and not trying to actually improve the word around you by working with what you've got, she couldn't think of anything to say. She thought that the Doctor would have seen it differently, but then the Doctor was far too good at walking away. She liked Cliff for being willing to stay.
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2. She could have passed her A-levels easily, but she got distracted by a crush on - going on obsession with - her chemistry teacher. In later life she was so embarrassed by this that it was easier to tell herself she was just rubbish at science, and a bit of a duffer generally. Her clumsiness helped convince herself of it, and it was only in her time with the Doctor that she began to realise there was more to herself than that.
3. She was profoundly disappointed that Cliff got involved with industry, but when he called her on it, and told her that it was no good spending all your time keeping your hands clean and not trying to actually improve the word around you by working with what you've got, she couldn't think of anything to say. She thought that the Doctor would have seen it differently, but then the Doctor was far too good at walking away. She liked Cliff for being willing to stay.