2nd Clarinet still stays below the break 2. Oboe, Horn and Timpani must be written as optional parts. Double the Horn with Tenor Sax to place both in a better range. The use of octaves in the horn is acceptable to assist young players with range difficulties. All low brass and low woodwinds in unison most of the time.
Some independence is acceptable.
Avoid awkward leaps in any part. Also avoid difficult notes like concert B, D-flat 6. Timpani is optional. Use only two pitches that do not change during the piece. Percussion I is reserved for Snare and Bass Drum.