diff --git a/app/src/main/java/com/qhy040404/libraryonetap/ui/tools/GradesActivity.kt b/app/src/main/java/com/qhy040404/libraryonetap/ui/tools/GradesActivity.kt
index edb197f0..a9d13b77 100644
--- a/app/src/main/java/com/qhy040404/libraryonetap/ui/tools/GradesActivity.kt
+++ b/app/src/main/java/com/qhy040404/libraryonetap/ui/tools/GradesActivity.kt
@@ -137,13 +137,22 @@ class GradesActivity : BaseEduActivity(), MenuProvider {
                         }
                     ).apply {
                         if (this.courses.isEmpty()) {
-                            delay(500)
+                            if (!Requests.initEduEval()) {
+                                delay(500L)
+                                if (!Requests.initEduEval()) return@apply
+                            }
+                            delay(500L)
+
+                            val token =
+                                CookieJarImpl.loadForRequest(URLManager.EDU_DOMAIN.toHttpUrl())
+                                    .find { it.name == "student_evaluation_token" }?.value
+                            if (token.isNullOrEmpty()) return@apply
+
                             val evaluationTasks =
                                 Requests.get(
                                     URLManager.getEduEvaluationTaskUrl(this.id),
                                     mapOf(
-                                        "Authorization" to CookieJarImpl.loadForRequest(URLManager.EDU_DOMAIN.toHttpUrl())
-                                            .find { it.name == "student_evaluation_token" }?.value.orEmpty()
+                                        "Authorization" to token
                                     ).toHeaders()
                                 )
                             val evalTasksObj = JSONObject(evaluationTasks).optJSONArray("data")!!
diff --git a/app/src/main/java/com/qhy040404/libraryonetap/utils/web/Requests.kt b/app/src/main/java/com/qhy040404/libraryonetap/utils/web/Requests.kt
index 110afdcd..cc8ef853 100644
--- a/app/src/main/java/com/qhy040404/libraryonetap/utils/web/Requests.kt
+++ b/app/src/main/java/com/qhy040404/libraryonetap/utils/web/Requests.kt
@@ -320,16 +320,13 @@ object Requests {
                 URLManager.EDU_CHECK_URL,
                 shouldHas = "person"
             ).also {
-                if (it) {
-                    initEduEval()
-                }
                 eduInitialized = it
                 return it
             }
         }
     }
 
-    private fun initEduEval() {
+    fun initEduEval(): Boolean {
         val initToken = get(URLManager.EDU_EVALUATION_URL).substringBetween("token=", "';")
         val finalToken = post(
             URLManager.EDU_EVALUATION_TOKEN_URL,
@@ -348,5 +345,7 @@ object Requests {
                     .hostOnlyDomain(url.host).build()
             )
         )
+        return !CookieJarImpl.loadForRequest(url)
+            .find { it.name == "student_evaluation_token" }?.value.isNullOrEmpty()
     }
 }