Sorting Subset Within A Query

How to sort a subset in a query. I have three fields BatchID,Month and Year. The BatchID can have multiple months and years. I would like to order the final sort so as the Batchs appeared in the order of the highest date combination with in each Batch.

The following is the SQL of my first Query which establish's the lowest and highest date in each batch.

Code:
SELECT tblRevOnlySelYear.BatchID, tblRevOnlySelYear.OperatorID, Max([Year] & IIf(Len([Month])=1,0 & [Month],[Month])) AS Expr1FROM tblRevOnlySelYear
GROUP BY tblRevOnlySelYear.BatchID, tblRevOnlySelYear.OperatorID
HAVING (((tblRevOnlySelYear.OperatorID)=1))
ORDER BY Max([Year] & IIf(Len([Month])=1,0 & [Month],[Month]));

The next SQL is the second query which results in the Batchs in the correct order by year but the months are not correct.

Code:
SELECT tblRevOnlySelYear.BatchID, tblRevOnlySelYear.OperatorID, tblRevOnlySelYear.Month, tblRevOnlySelYear.Year, qryRevTest4_1.[1stDate], qryRevTest4_1.LastDateFROM qryRevTest4 AS qryRevTest4_1 INNER JOIN tblRevOnlySelYear ON qryRevTest4_1.BatchID = tblRevOnlySelYear.BatchID
WHERE (((tblRevOnlySelYear.OperatorID)=1))
ORDER BY qryRevTest4_1.LastDate;