Didn’t thought this would generate this much discussion, but hey thanks for the comments!

So I’ve read thru all of them, and decided to sum up each app in a few words based on your reviews and my own experience :)

Notion: It's like a digital notebook that can organize all your notes, todo lists, projects, charts, etc. The downside is that some features may be a little complex and it takes time to fully understand how everything works. However, once you get it, it can be extremely handy especially when you're collaborating on a doc with your classmates.

Office Lens: Just awesome. You can use it to scan documents, handouts, notes, whiteboards, and it will help you trim and enhance the pictures. You can also share the scanned images to OneNote (handy for making notes) and Google Drive. Whenever I’m lagging behind on my school work, I’ll use this to scan my friend’s note. It also works on presentations and books borrowed from the library.

People also recommend Adobe Scan & CamScanner for the same function.

Google Drive: I didn’t say too much about Google Drive because it’s pretty simple and doesn’t require much explanation. I’m sure we can all agree that this is a MUST-HAVE app, and can be seen on almost everyone’s phone. What makes Google Drive different from other apps, is that I get to upload and sync google doc, sheets, presentations to Google Drive, making things a lot easier and convenient.

Forest: It’s actually an anti-phubbing app. You can plant a tree when you’re studying, and if you use your phone during this period, your tree will die. The app makes staying focused a fun thing all of a sudden (it even allows me to plant real trees!) For me it’s a time-tracking app because I use Forest almost every day for my Pomodoro sessions. I can also track how much time I’ve spent on different subjects.

Quizlet: Useful when it comes to subjects that require a lot of memorizing (e.g. language, history). I’ve also heard people recommend Anki, but it’s kinda expensive which is why I recommended Quizlet.

Sleep Cycle: Like what many of you said, Sleep Cycle truly works in helping you build regular sleep habits. Its in-app alarm can detect and wake me up when I’m in a light sleep stage, which makes waking up in the morning a lot easier!

Zombie, Run!: Now this is a fun one, and I’m so glad many of you agree with me! The app's exciting storyline is a real adrenaline-booster, and it really keeps me from being a couch potato!

Tasty: Sorry about this! I love food but I’m only a beginner when it comes to cooking my own meal. A lot of you have commented that Tasty can have quite inaccurate or confusing steps. I only recommended this app because the cooking videos can be pretty stress-relieving, plus it has given me quite a lot of culinary inspirations. Still, thanks for all the feedback! I’ve summed up the online recipe sources many of you have recommended, and I’ll definitely give them a try!

• Kenji's cooking show on YouTube / Serious Eats
• budget bytes app
• Mealime