<u>Answer</u>:-
When she first started at new school, it seemed more difficult than the/her old one.
Explanation:-
The comparative degree of the word difficult is “more difficult”.
Hence, difficulter is totally incorrect to say or write.
Answer:
when you don't have enough sleep, you become exhausted. Or that the remedy or resolution to exhaustion is to sleep.
Explanation:
context
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The answer is in the comments