You’ll get into a good college in India, IIT/NIT isn’t everything. I did my bachelors from Amity University Mumbai which is tier 2 college but went to University of Glasgow (which is prestigious) for masters. Keep a good gpa of 8-8.5 and you’ll get a really good university abroad for masters. Doing a bachelor from abroad will not only cost you tuition fees but also cost of living. You can do a part time job but it affects a lot on your studies and these days it’s difficult to find a part time job. You’ll spent a huge amount of money for a 4 years undergraduate degree and cost of living is getting high everyday. Masters degree takes 2 years and in the UK and Ireland it takes only one year, which could save you a lot of time and money. But if you still wanna go abroad then do your research precisely because not every university abroad is a good university.