Form the UK gov website

7. Travelling alone

You can travel to the UK without an adult (someone over the age of 18).

Your parent or guardian will need to provide their:

• written consent for you to travel to the UK
• full contact details

They’ll also need to provide proof that you have somewhere suitable to live during your stay in the UK, including:

• the name and date of birth of the person that you will be staying with
• an address where you will be living
• details of your relationship to the person who’ll be looking after you
• consent in writing so they can look after you during your stay in the UK

You must provide a letter from the school confirming it has notified the local authority of your visit and your care arrangements if:

• you’ll be studying in the UK during your stay
• you’re under 16

You must include the reply from the local authority if the school has received one.

I can go same visa?

No clarification on the website regarding this. I would confirm with the consulate, if I were you. First hand information in much better in these cases.

Form the UK gov website

7. Travelling alone

You can travel to the UK without an adult (someone over the age of 18).

Your parent or guardian will need to provide their:

• written consent for you to travel to the UK
• full contact details

They’ll also need to provide proof that you have somewhere suitable to live during your stay in the UK, including:

• the name and date of birth of the person that you will be staying with
• an address where you will be living
• details of your relationship to the person who’ll be looking after you
• consent in writing so they can look after you during your stay in the UK

You must provide a letter from the school confirming it has notified the local authority of your visit and your care arrangements if:

• you’ll be studying in the UK during your stay
• you’re under 16

You must include the reply from the local authority if the school has received one.

I can go same visa?

As @GayotFlow mentions, the issuing post will write the conditions on the entry clearance itself. If the conditions stipulate that an adult is required, then they cannot travel alone. Otherwise it's ok. In both cases, it's an EXPLICIT amendment made by the consulate.