M.Tech

You have three options i.e. Job, Higher Education in Chemical or Management. Choice between MBA / MTech or job is the most common dilemma facing B Tech graduates. If you intend doing MTech and specialize in one of the chemical engineering subject , it will better to continue with education and do M Tech. MTech qualification offers you better jobs and a freedom to make career in technology. However if you plan to do MBA it will ideal to go for job and gain 3 to 4 years experience to maximise your career opportunities and benefits. This option has a big challenge. While on job, you may not find time to prepare for MBA exam and it may reduce your chances to get admission to tier I college. In case you feel that you may not have motivation to prepare while on job, you may go for MBA now. You can chose an option based on your interest, preferences and personal reasons.

NewZealand gives you very good stay back option. As you have mentioned that you are looking for Mtech. it is Level 9 program and it will cost you around 23 to 25 lakhs tuition fees plus living expenses.You can take up any Level 7 degree level diploma program. it is one year student visa and it will cost you only 7.5 lakhs tuition fees plus living expenses. once you finish this you will be given one year work search visa. on getting a job you will be given 2 yrs work visa. on getting this visa you are eligible to get PR and settle down.
In other words you will get permanent resident permit within two years and 6 months. after that you can do your masters which will cause St you only of 25% of the international student fees.
Alternatively you can also do level 8 PG diploma one year program which will cost you only around 10 to 12 lakhs.
You will surely get her bs in new Zeeland because the economy there growing @ of 23%. Very important no corruption over there.