B+ In my Lifespan Development Class? Is it good or bad? Try again, perhaps

[2L8]

Hi ,

 I recently took my final for my human lifespan development class and I'm sorta disappointed in the result. That I got I went from a A- ( Like a 92) to a final grade of an 88.13%. I was aiming to stay in the " A" zone when it came to this semester but didn't achieve that. My other grades are a B+ in British Literature , but that was to be expected. But back to the lifespan development course , I aspired to be a nurse and my counselor told me that this course is crucial in when it comes to becoming a nurse and that I should aim for an A or higher. When the results came in I was very disappointed and felt like I could've did better , but another teacher said that I did awesome. From your perspective is this a good grade for Lifespan development or should I try again?