IET Lucknow is not a good option to pursue M.Tech. You will not be offered any good opportunities at this institute. However, if this is your only available choice, then you can go for it. 

IET Lucknow will surely groom your personality as it offers a lot of opportunities for extracurricular activities. You can be a part of various clubs and societies. In terms of academics, there is no exposure and no technical knowledge is given by faculty members.

Although you will get a lot of time to learn new things on your own and gain the technical knowledge required for the industry. Placements are also not good and you have to apply off-campus. 

Do not join IET Lucknow for M.Tech but if even if you do, make sure to prepare well for further competitive exams. You will receive a monthly stipend of 15,000 rupees and other necessary amenities.