Final answer:
The sentence is already in correct form and does not have any plural or possessive errors.
Step-by-step explanation:
Ramonda went through seven calculators this school year.
The sentence is already in correct form and does not have any plural or possessive errors. The subject of the sentence is 'Ramonda', and the verb is 'went through'. The phrase 'seven calculators' is the direct object of the verb, indicating the number of calculators Ramonda went through.