Hi We use 'in' months, years and periods of time: in January in 1978 in the twenties So, I feel 'in' is correct here. Check your own sentence again, there is an instance of 'in' here: On April 2011 the chicagonews cooperative reported that in October 2010 the Chicago Public Schools placed an estimate of 53 percent of schools on probation for the 2010-2011 school year, along with a map. Prajwal
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On April 2011 the chicagonews cooperative reported that