Bah, I can't play m3u files. Not fair. *raises fist*
In your score, trumpets go above horns in concert band writing. Only in orchestra do horns go on top. Also, add brackets to your instrument parts, there should be separate (smaller) brackets around the 1st to 3rd clarinets, alto saxes, horns, trumpets, and bones. Horn 3 plays higher notes than horn 2. Horns 1 and 3 are high parts, 2 and 4 are low parts. Keep that in mind. So all you have to do is switch your 2nd and 3rd parts.
Watch for collisions between elements like dynamics and slurs. Measure 15, your dynamic should be right below the first note in glockenspiel, not somewhere after. Pianissimo in first measure is a little bit low for bassoon, should just nudge it up a little closer. Measure 5, you gave cues to horn 1 and 2 to alto sax 1, but not to alto sax 2. Go ahead and add the cues for horn 3 and 4 to alto sax 2. If a director wants the saxes to play the saxes, at least there will be full harmony. Measure 14, euphonium doesn't get a dynamic... the poor bloke. =[
Measure 15, piccolo and flute collision, eek! Measure 19, saxes. Simile. Simile what, exactly? Looking at the clarinet parts, I'll bet you want them slurred... but write the slurs. It's unclear what you are similie-ing in the saxes. Honestly, I wouldn't write a similie in the clarinets either, just keep writing slurs. Measure 15 and 16, low brass... slurs colliding with tenuto markings. Urrgh. Fixy, fixy! Ohh, I hope the 1st clarinets know the alternate fingering for B natural at letter B... otherwise they could never play those sixteenths slurred. I don't know about you, but I usually write my key signature in the timpani part. Just a preference, I think, though. I'm not sure I'd bother writing that clarinet cue in euphonium, especially with the clef change. Might confuse them, might not.
Measure 59, flutes. Put flute 1 and 2 on top of each other, not displaced or offset. Also, beats 3 and 4 are just generally a mess. Maybe expand to two staves, the way you have it is just ugly. And you've had a single flute part this whole time... and suddenly decide to split parts. Odd. Measure 60, trumpet 2/3... nasssty articulation collisions. Are those clarinet tremolos at E supposed to be in time or not in time/counted?
Letter G... holy crap that will be loud. Gong and ffff bells and everything, bloody hell... Wheee, difficult clarinet part at H. XD . . .
Just keep an eye out for the collisions all over the place - sweat the little stuff.
