reduce space at the top using maketitle
Include the \vspace
command in the title command, i.e. change the line
\title{Title}
into
\title{\vspace{-2cm}Title}
The titling
package can help you in this.
From its documentation:
The
titling
package provides control over the typesetting of the\maketitle
command
In your case, adding these lines in the preamble (adjust -3cm
to your needs) should do what you want:
\usepackage{titling}
\setlength{\droptitle}{-3cm}
Have a look at the documentation for more options (e.g. spacing after the title)