Ms Access Query - Can this query be redesigned to provide summary data only

The query below produces enrollment data for every grade in the school for a given year.  I would like to create a query that provides just a total enrollment number per school for the given year.  The current query when parameters are applied produces the following as an example:

School A for a certain year
Grade 6 100
Grade 7 100
Grade 8 100

I have a report that sums the totals and compares them.  I would like a query that does the summing for use in other reports.  For example when the year parameters are applied I just want the total as below.

School A 300

My current sql follows

SELECT enrollment.er_school_id, Sum(IIf([Year]=forms!select_dates!current_year,[enroll_data],0)) AS [Current Enrollment], Sum(IIf([Year]=forms!select_dates!proposed_year,[enroll_data],0)) AS [Proposed Enrollment], ([Proposed Enrollment]-[Current Enrollment]) AS [+/- Enrollment], enrollment.enroll_desc, enrollment.erdisplay_order, schools.schoollName, schools.school_id, Enroll_gradeNames.dgrdisplay_order, schools.Type
FROM schools INNER JOIN (enrollment LEFT JOIN Enroll_gradeNames ON enrollment.enroll_desc = Enroll_gradeNames.Grade_name) ON schools.school_id = enrollment.er_school_id
WHERE (((schools.open_date)<="forms]![select_dates]![current_year]") AND ((schools.close_date)>=[forms]![select_dates]![proposed_year]))
GROUP BY enrollment.er_school_id, enrollment.enroll_desc, enrollment.erdisplay_order, schools.schoollName, schools.school_id, Enroll_gradeNames.dgrdisplay_order, schools.Type;

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