Can an average student get good grades?

[jonasc173]

So I have only gotten average marks since my 7th class and in 12 I got 68% now I am repeating a year in college due to failing in two subjects. In my first year my chap was 2.96. I failed my third semester. How do I study to get A grades since I am repeating the year it’s very important my grades are good now.