I'm a MERN stack developer but want to crack google interview, so could I use javascript (or ts) to solve DSA problems there or should I need to solve it with cpp?

I'm leaving my company and my boss assigned me some tasks, so is it necessary to complete all those task to get experience letter? If I can't then do I have to work extra days to finish it?

1.2 years ago, I was an intern, In letter they've written that 4 hours to work but I was working 12 hours daily cause I was curious and my boss appreciate for this. so one day while testing our app at 3 am in the night, he said, u r working too hard, so u can take a Smart Phone from my side of worth ~$250. I was so happy. He said it is a gift for ur dedication. Also, they've given ~$250 on my initial day while joining to upgrade my PC. But now, I've provided my resignation letter. So they've asking me to give back the Phone cause its a company asset and also give back the money. But later they said don't give the money but deliver the Phone before 15 Jan. So, idk am I an idiot or what but I was working more harder and helping more people in company so that they're provide more stuff and get impressed. But now I think i should not do anything and do my work as a duty. Idk, should I return the phone, should I ask my boss again that u have given it as a gift or should I return another $250? I'm a student, I don't earn much and my boss knew it very well. like after 2 year of experience in MERN stack/ Azure/ Flutter, I've created many things in company and they've decided to give $3,607/year according to my new offer letter. That's why I left the company.

My friend Just completed his notice period in my company, but now he's saying that I forgot to copy some code for reference like their architecture and authentication code, so, he's asking me to share the repo code of my company. The company has deleted all his data while he was leaving. So what should I do? should I share the code without including .env files or what should I do?

I’m 20 years old MERN (Mongodb, Express.js, React.js, Node.js) Stack Developer, Working in a start up as a full time employee. They’re paying me 20k (INR) (< $300)/month. I’m in 2nd year of my college for my Bachelor’s Degree in computer Science. My Job is work from home. I’m doing programming for 4 years now. I have 1 year full time experience and extra 6 months internship in the same company and also doing freelance for 1 year. I’ve worked on many technologies like AWS, Azure, GCP, React, Tailwindcss, Flutter, Node.js, Express.js, Docker, Vercel, Linux and keep learning things cause I love doing this. But I think my salary is too low, I work 6 days/ week. They promised me that they’ll increase my salary but I don’t think they will. I think there is a lot I can achieve but nothing I can see right now. I’m not comparing myself to anyone but I think I’m eligible to get good food and good Education cause I’m paying for everything (College, food, etc). Family is not supporting after I started earning. I’ve basic understanding of DSA, Networking, etc. Pls Guide me, Please like what to do.. should I leave my job, if I do then I’ve to serve 45 days of notice period.. They said they’ll raise some amount from this new year. So should I wait to get the offer letter then should I quit.. and even after I quit then where should I apply? Should I apply abroad or Bengaluru? Should I take IELTS Certificate or any other tech certifications? Please Help, PLEASE PLEASE PLEASE🙏🙏🙏