from json import loads

with open('data.json', 'r') as f:
	raw_data = f.read()
	f.close()
data = loads(raw_data)

# Data for further analyze
stud_i = []
stud_score = []

stud_80_plus = []
for i in range(len(data)):
	stud_i.append(i)
	average_score = (data[i]['grades']['math'] + data[i]['grades']['physics'] + data[i]['grades']['history'])/3
	stud_score.append(average_score)
	if data[i]['grades']['math'] > 80:
		stud_80_plus.append(i)

average_best = max(stud_score)
aver_i = stud_score.index(average_best)
aver = data[aver_i]

print(f'''Student with best average score:
{aver['name']} {aver['age']} {aver['grades']['math']}-{aver['grades']['physics']}-{aver['grades']['history']}
''')

print('Students with 80+ math scores:')
for i in stud_80_plus:
	stud = data[i]
	print(f'''{stud['name']} {stud['age']} {stud['grades']['math']}-{stud['grades']['physics']}-{stud['grades']['history']}''')