Usefulness of speaking more than one language

First of all, if you are a bilingual, person you have had to study hard and practise a lot, so you also have a great capacity for processing a lot of all information.

Being a bilingual person is a goal very difficult goal that needs many a lot of work for a long time, in addition to assist to support extra classes.
One of the advantages is if you study in high school, you will pass your exams without problems and you will have good marks in your secondary language. Moreover, you can help other people to improve and in some cases, you would may earn [more] money.

On the other hand, if you travel abroad, you won't have problems to speak with citizens the locals. Apart from this, if you have enough capacity to learn one language you can learn other languages and the advantages will be triple best!

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Phrases in red are not necessary, although I understand in Spain you are taught to use them in order to pass English exams. They are not incorrect, but native speakers do not consider them good writing.