In summary: read, practice, think.
Try to do some extra practice, research, think why "this is so-and-so", ask other people, etc.
The comparative and superlative forms of intelligent are more intelligent and most intelligent.
Anyone can learn math, at least to some degree. If you are learning an advanced form of math, then you are an intelligent person.
Math major are very intelligent and brainy compared to liberal art majors.
"Intelligent" doesn't have a comparative and superlative form. Instead, you would say "more intelligent" or "most intelligent."
Dr. Sigmond Frued albert Einstein
"More intelligent" is the comparative form of intelligent. "Most intelligent" is the superlative form. There is no such word as "intelligenter".
Zoe is the most semi-intelligent person in her math class.
more intelligent, most intelligent
more intelligent, most intelligent
more intelligent, most intelligent
More intelligent,Most intelligent.
more intelligent