Update README.md

challenge/README.md

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 ### TL;DR
-* The purpose of this folder is to facilitate our CVPR 2024 challenge. Initially, we will use a small subset of training data (**demo train** in the following text) as an illustrative example, demonstrating how to obtain the **test data format** and the submission format, how to train the baseline and infer the baseline, and go through the evaluation pipeline. 
+* The purpose of this folder is to facilitate valid submission to DriveLM official test server. Initially, we will use a small subset of training data (**demo train** in the following text) as an illustrative example, demonstrating how to obtain the **test data format** and the submission format, how to train the baseline and infer the baseline, and go through the evaluation pipeline. 
 
 * Thrilled to announce that the test server is online and the test questions are release! Check `DriveLM-nuScenes version-1.1 val` and [How-to-submit](#submit-to-test-server).
 
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 ```
 Email Subject:
-[CVPR DRIVELM] Failed submission - {Submission ID}
+[OFFICIAL DRIVELM] Failed submission - {Submission ID}
 Body:
   Your Name: {}
   Team Name: {}