Good for you. See a college counselor for most of your questions. But basically, to succeed academically all you need to do is apply yourself, study hard, be disciplined and organized, turn your assignments in on time and don't be afraid to ask your teachers/professors questions.
I want to study BOTANY in my higher institution, so please can anyone in the board send some PDF files regarding botany to me please.
The first thing you should to is learn to research things yourself. Google is a useful tool for searches.