<p>You may want to check your knowledge by looking up math journal articles or books written in French, German, and/or Russian and checking if you can understand them.</p>
<p>[SMF</a> - Publications - Bulletin de la SMF - Parutions - 141 (2013)](<a href=“http://smf4.emath.fr/Publications/Bulletin/141/html/]SMF”>Les Publications | Société Mathématique de France) has some abstracts of math papers in both French and English to look at (the full articles are behind a paywall).</p>