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”till"- it is an acceptable word, however, it would sound better if you used until. It indicates that you are doing something from date A until date B.

 Elena found the article about it. I booked it without hesitation-    Here you have two smaller sentences that can be merged into one. "Elena found the article about it, "which" i booked without hesitation." You can take out the word it for it you already described what you are talking about, in this case the article. The word used which indicates a word that combines the sentences.

collage- I believe you mean college.

english- English. Make sure to capitalize the word.

It has been unclear to stay in Perth lately except that I want to save up money. I can get the reason why I'm here until October.    It is as bit tricky to full understand what you're meaning here. What/where is Perth? Why are you trying to save up money? What reason can you get to stay "here" until October?

Overall, it was a very good and understandable read! Please continue your hard work!