This is not a smart goal because when you say "I will do better in school" is such a vague statement. A better goal would be I will do better in school by studying, see that way you have a goal and solution to help you achieve your goal.
Yes it is because once you start doing better you will be able to up your grades and have more freedom when it comes to the summmer so you can go out and have fun and also so you can succeed in your future
