just delete the packages you don't what from (setq org-latex-default-packages-ali
st
'(("AUTO" "inputenc" t)
("" "lmodern" nil)
("T1" "fontenc" nil)
("" "fixltx2e" nil)
; ("" "charter" nil) ;; a decent font
; ("expert" "mathdesign" nil)
("" "graphicx" t)
("" "longtable" nil)
("" "float" nil)
("" "wrapfig" nil)
("" "rotating" nil)
("normalem" "ulem" t)
("" "amsmath" t)
("" "textcomp" nil)
("" "marvosym" t)
("" "wasysym" t)
("" "amssymb" t)
("" "amsmath" t)
("version=3" "mhchem" t)
("numbers,super,sort&compress" "natbib" t)
("" "natmove" nil)
("" "url" t)
("" "minted" nil)
("" "underscore" t)
("linktocpage,pdfstartview=Fit
H,colorlinks,
linkcolor=blue,anchorcolor=blue,
citecolor=blue,filecolor=blue,menucolor=blue,urlcolor=blue"
"hyperref" nil)
("" "attachfile" nil)))