My recommendations:
Continue studying using traditional techniques, especially for topics that require understanding, reasoning, etc.
Utilize Mnemonic techniques to ASSIST in your studies, not to REPLACE them
Mnemonic techniques are best for factual information
For example:
Dates
Numbers
Names
Sequences
In chemistry, use Mnemonics to memorize the periodic table, but utilize traditional methods to understand chemical reactions
In history, Mnemonics will rock
In calculus, less so
First start relatively small
Here is a link on starting one for the periodic table
Hope that helps!
Ray