Today I heard about your plans for the future and I confess that although I was proud to know that you are planning to enter the business, I was a little concerned to know that you plan to leave school.
I don't want to control your steps towards the future, but I believe that finishing high school will be more profitable for you, so I ask that you finish your studies first, because the future is very uncertain and with high school completed I will know that you will have others alternatives to follow if the business sector is not as promising.
In that case, I ask that you reconsider your decision and better evaluate all possible scenarios to which you would be inserted if you left school.
Numbers 4, 7, and 12 have parallel sentence structures. You can tell because the forms of the verbs are consistent: all -ing verbs, or all infinitive (to...).