A bit lengthy. It passed 8/10 test cases. Not sure why it fails 2.

if __name__ == '__main__':
    mylist = []
    
    
    for _ in range(int(input())):
        name = input()
        score = float(input())
        nestdct = {name:score}
        mylist.append(nestdct)
    
    newlist = []
    
    for d in mylist:
        for v in d.values():
            newlist.append(v)
    
        
    wrdlist = []
    
    newlist.sort()
    
    grade = newlist[1]
    
    for d in mylist:
        for k,v in d.items():
            if v == grade:
                wrdlist.append(k)
    
    wrdlist.sort()
    for word in wrdlist:
        print(word)
            

if name == 'main': records =[] names =[] scores =[]

for _ in range(int(input())):
    name = input()
    score = float(input())
    records.append([name,score])


for i in records:
    names = [i[0] for i in records]
    scores = [i[1] for i in records]
unique_score = sorted(set(scores))[1]
name = sorted([i[0] for i in records if i[1] == unique_score])
for n in name:
    print(n)

if name == 'main': records = []

for _ in range(int(input())): name = input() score = float(input())

        records.append([name,score])

scores = []
for inner in records:
        scores.append(inner[1])

unique_scores = sorted(list(set(scores)))

secondLowest_score = unique_scores[1]

names = []
for inner in records:
        if inner[1] == secondLowest_score:
                names.append(inner[0])
                names.sort()

for name in names:
        print(name)

it is a  bit long but i tried my best
if __name__ == '__main__':
scores=[]
sublist=[]
minpoint=100
min_name=[]
indexofmin=[]
numbersofscore=[]
min1=100
min2=100
for _ in range(int(input())):
    name = input()
    score = float(input())
    sublist.append(name)
    sublist.append(score)
    numbersofscore.append(score)
    scores.append(sublist)
    sublist=[]
for j in numbersofscore:
    if(j<min1):
        min2=min1
        min1=j
    elif(j<min2 and j!=min1):
        min2=j    

indexofmin=[i for i in range(len(numbersofscore)) if(min2==numbersofscore[i])]
min_name=[scores[z][0] for z in indexofmin]
min_name=list(sorted(min_name))
for i in min_name:
    print(i)

if name == 'main': students = [] for _ in range(int(input())): name = input() score = float(input()) students.append([name,score])

scores = [i[1] for i in students]
second_low = sorted(set(scores))[1]

names = sorted([i[0] for i in students if i[1] == second_low])
for name in sorted(names):
    print(name)