While no one is going to mistake your coach for Bowerman, depending on how he sets up your rest and how often you run each workout, he could easily have you within 5 seconds of the best mile you were going to run this year no matter who was training you.
We could argue that but right now you have more important things to think about. I ran into the post below on here in the last couple of days and it REALLY applies to you even if your 200m was mistimed by a second. You can run 1:56.X, even 1:55.X if the 200 was timed correctly.
"My story: I ran 2:02 to 2 flat for a year and a half in H.S. I could run 2:01 on a dirt track and a couple days latter run the same time on an artificial track. I could run it in the rain, the wind, doubling, tripling, I could finish 1st or last, at dual meets, invitationals, no matter what, I could not break 2. I ran one 2:00 at a tri meet and I split 2:0x several times on a 4x8s. I was very consistent.
One of my high school's best 800m runners was also 400m runner and we had one of the nation's best 4x4s. Our coach was not going to allow this 400m runner to run on the Penn Relays 4x8 unless everyone on our 4x8 could run sub-2 and I was the only one on that relay who could not run sub-2. One week before the Penn Relays we ran at an invitational meet, this was my last chance to run sub-2 in order for our relay to run at the Penn Relays.
Before the race I got two pieces of advice, my coach said run the first 600 all out and put the last 200 in God's hand. My teammate and best friend said go straight to the lead, make everyone chase you and when you come off the final turn pump your arms and run like you are practicing high knee lifts.
I ran 1:57.7 in that race. My first 400 was 54, only 2 seconds slower than 400m PR. I never heard the split, which was probably a good thing because it was 5 seconds faster than I had ever gotten out. I was practically crawling the last couple of meters, I could barely stand after the race, but I felt like I had hit the lottery because mainly because it was the first time I had won a H.S. individual race and set a massive PR.
The following week I split 1:56.7 in the Penn Relays prelim race and split 1:56.2 in the Championship of America. Our 4x8 finished 4th in the COA even with a dropped baton. Long story short, for me it was just a matter of understanding how to run the 800m. Sounds simple, but you really do need to get out beyond your comfort level and fight through 800 specific type pain."