I've watched a lot of western movies and studied English at DMM over the last six years, so I was able to pass level two of the English proficiency test without too much difficulty.
この場合、次のような言い方ができます。
ーI've watched a lot of western movies and studied English at DMM over the last six years, so I was able to pass level two of the English proficiency test without too much difficulty.
「洋画をたくさん見て、DMMでこの6年間英語勉強したので、あまり苦労することなく英検2級に合格した」
to pass level two of the English proficiency test「英検2級に合格する」
without too much difficulty「あまり苦労することなく」
ご参考まで！
I am thankful to my parents for letting me enjoy listening to Western music and watching Western movies since I was a child.
I also continued DMM Eikaiwa for six years, so I was able to pass the Eiken's 2nd level without too much struggle.
ご質問ありがとうございます。
"I am thankful to my parents for letting me enjoy listening to Western music and watching Western movies since I was a child."＝「私は両親に感謝しています、洋楽と洋画を子供のときから聴いて、観ることを楽しませてくれて。」
"I also continued DMM Eikaiwa for six years,"＝「私はDMM英会話を6年間続けました」
"so I was able to pass the Eiken's 2nd level without too much struggle."＝「なので、あまり苦労せずに英検二級を取ることができました。」
ご参考までに。
カナダ 
アメリカ合衆国 
