I'm very happy that you've been able to continue studying up until this point.
You've always tried your best.
ご質問ありがとうございます。
「ここまで一緒に勉強を続けて来られてうれしいです」は英語で「I'm very happy that you've been able to continue studying up until this point.」と言います。
また、「いつもよくがんばっているね」と追加したいなら、そうすると、「I'm very happy that you've been able to continue studying up until this point. You've always tried your best.」になります。
ご参考になれば幸いです。