Ya I would do it D side, Front F, and then Finger D and raise your B. It should sound fairly easy. As someone already said G is much harder to sound then A. Overall A is one of the easier notes to sound. I would use a tuner and it should sound really good.

ah second prelude is great we played that my freshman year... i use OK with a-d keys, but ive found that is harder on my classical setup for some reason. for me i could always get the g, but until a few months ago my a just would not come out. good luck

I usually use OK + A and G, and it helps my private lesson teacher when he uses right hand (F, E, D + D# keys) with it.

Have you tried a harder reed?

Opening the throat is usually the ticket. Practice altissimo as loudly as possible at first to get them to pop. It's really annoying, but really fun too. Treat altissimo notes the way you would play overtones. Again, practice them loudly until your oral cavity has trained enough to control note and pitch at any volume level. Here's a good altissimo fingering chart that I made. : ) It has some of the best long and short fingerings I know..both alto and tenor.