diff --git a/api/migrate-mysql.js b/api/migrate-mysql.js
index b257d887..68fbacb0 100644
--- a/api/migrate-mysql.js
+++ b/api/migrate-mysql.js
@@ -161,13 +161,18 @@ async function importData() {
         e.years = element.years;
         e.enabled = element.enabled;
         e.enable_sharing = element.enable_sharing;
-        e.groups = {}
+        const my_groups = {}
         groups
             .filter(g => g.degree_id===element.id)
-            .map(g => {
-                e.groups[g.name] = exams_groups
+            .forEach(g => {
+                const exam_ids = exams_groups
                     .filter(eg => eg.group_id===g.id)
-                    .map(eg => exams[eg.exam_id]._id)});
+                    .map(eg => new ObjectId(exams[eg.exam_id]._id))
+                my_groups[g.name] = exam_ids
+            })
+
+        e.groups = my_groups
+
         if (element.default_group_id) {
             e.default_group = group_by_id(element.default_group_id).name;
         } else {
diff --git a/frontend/src/modules/engine.tsx b/frontend/src/modules/engine.tsx
index e316cb99..c703b054 100644
--- a/frontend/src/modules/engine.tsx
+++ b/frontend/src/modules/engine.tsx
@@ -341,33 +341,47 @@ export type ProposalGet = {
     attachments: ProposalAttachmentGet[],
 }
 
-export type ProposalExamGet = {
+export type ProposalExamGet = 
+    ProposalCompulsoryExamGet |
+    ProposalCompulsoryGroupGet | 
+    ProposalFreeChoiceGet
+
+
+export type ProposalCompulsoryExamGet = {
     __t: "CompulsoryExam",
     exam_id: string,
     exam_name: string,
     exam_code: string,
     exam_credits: number,
-}|{
+}
+
+export type PoposalCompulsoryGroupGet = {
     __t: "CompulsoryGroup", 
     group: string,
     exam_id: string,
     exam_name: string,
     exam_code: string,
     exam_credits: number,
-}|{
+}
+
+export type ProposalFreeChoiceGroupGet = {
     __t: "FreeChoiceGroup",
     group: string,     
     exam_id: string,
     exam_name: string,
     exam_code: string,
     exam_credits: number,
-}|{
+}
+
+export type ProposalFreeChoiceGet = {
     __t: "FreeChoiceExam",
     exam_id: string,
     exam_name: string,
     exam_code: string,
     exam_credits: number,
-}|{
+}
+
+export type ProposalExternalExamGet = {
     __t: "ExternalExam", 
    exam_name: string,
    exam_credits: number,
diff --git a/frontend/src/pages/ProposalPage.tsx b/frontend/src/pages/ProposalPage.tsx
index c13d117b..04d37a17 100644
--- a/frontend/src/pages/ProposalPage.tsx
+++ b/frontend/src/pages/ProposalPage.tsx
@@ -1,4 +1,4 @@
-import React, { useState } from 'react'
+import React, { Dispatch, SetStateAction, useState } from 'react'
 import { useParams } from "react-router-dom"
 import {Button} from 'react-bootstrap' 
 import assert from 'assert'
@@ -7,7 +7,7 @@ import { useEngine, useGet,
     useIndexExam, useGetProposal, 
     useIndexDegree, useIndexCurriculum, 
     useGetDegree, useGetCurriculum, useGetExam,
-    ExamGet, ProposalGet, ProposalExamGet } from '../modules/engine'
+    ExamGet, ProposalGet, ProposalExamGet, CurriculumExamGet } from '../modules/engine'
 import LoadingMessage from '../components/LoadingMessage'
 import Card from '../components/Card'
 import {formatDate,displayAcademicYears} from '../modules/utils'
@@ -138,8 +138,15 @@ function ProposalForm({ proposal }:{
 
     console.log(chosenExams)
 
-
-    function ExamSelect({ exam, allExams, groups, yearNumber, examNumber, chosenExams, setChosenExams }) {
+    function ExamSelect({ exam, allExams, groups, yearNumber, examNumber, chosenExams, setChosenExams }:{
+        exam: CurriculumExamGet,
+        allExams: {[key: string]: ExamGet},
+        groups: {[key: string]: ExamGet[]},
+        yearNumber: number,
+        examNumber: number,
+        chosenExams: (ProposalExamGet|null)[][],
+        setChosenExams: Dispatch<SetStateAction<(ProposalExamGet|null)[][]>>,
+    }) {
         if (exam.__t === "CompulsoryExam") {
             const compulsoryExam = allExams[exam.exam_id]
             return <li className='form-group exam-input'>
@@ -156,23 +163,40 @@ function ProposalForm({ proposal }:{
             </li>
         } else if (exam.__t === "CompulsoryGroup") {
             const options = groups[exam.group]
+
+            function isCompulsoryGroupExam(exm: ProposalExamGet|null): asserts exm is ProposalExamGet {
+                assert(exm !== null && exm.__t === "CompulsoryGroup")
+            }
+
+            const exm = chosenExams[yearNumber][examNumber]
+
+            assert (!exm || exm.__t === "CompulsoryGroup")
+            console.log(exm?.exam_id)
             return <li className='form-group exam-input'>
                 <div className='row'>
                     <div className='col-9'>
                         <select className='form-control'
-                            value={chosenExams[yearNumber][examNumber] || -1}
+                            value={exm ? exm.exam_name : -1}
                             onChange={e => {
-                                let newChosenExams = chosenExams
-                                newChosenExams[yearNumber][examNumber] = e.target.value
+                                const newChosenExams = chosenExams
+                                const newExam = allExams[e.target.value]
+                                newChosenExams[yearNumber][examNumber] = {
+                                    __t: "CompulsoryGroup",
+                                    exam_id: newExam._id,
+                                    exam_name: newExam.name,
+                                    exam_code: newExam.code,
+                                    exam_credits: newExam.credits,
+                                    group: exam.group,
+                                }
                                 setChosenExams(newChosenExams)
                             }}
                         >
                             <option disabled value={-1}>Un esame a scelta nel gruppo {exam.group}</option>
-                            {options.map(opt => <option key={opt._id} value={opt._id}>{opt.name}</option>)}
+                            {options && options.map(opt => <option key={opt._id} value={opt._id}>{opt.name}</option>)}
                         </select>
                     </div>
                     <div className="col-3">
-                        <input className='form-control col' readOnly value={chosenExams[yearNumber][examNumber] ? allExams[chosenExams[yearNumber][examNumber]].credits : ""}/>
+                        <input className='form-control col' readOnly value={exm ? allExams[exm.exam_id].credits : ""}/>
                     </div>
                 </div>
             </li>
diff --git a/frontend/src/pages/SinglePage.js b/frontend/src/pages/SinglePage.js
index 7ef14380..c794357a 100644
--- a/frontend/src/pages/SinglePage.js
+++ b/frontend/src/pages/SinglePage.js
@@ -61,7 +61,6 @@ function SinglePageInternal () {
                             <Route path="/" element={<Splash/>}/>
                             <Route path="/index.html" element={<Splash/>}/>
                             <Route path="/proposals/edit/:id" element={<EditProposalPage/>}/>
-                            <Route path="/proposals/edit" element={<NewProposalPage/>}/>
                             <Route path="/proposals/:id" element={<ProposalPage/>}/>
                             <Route path="/proposals" element={<ProposalsPage/>}/>
                             {/* <Route path="/proposals/new" element={<ProposalPage/>}/> */}