NLS1 galaxies exhibit narrow permitted Hβ lines (FWHM < 2000 km/s) and strong Fe II multiplets with low BH masses(< 108 M⊙)and high Eddington ratio indicating that they are early-stage AGN. They host the lowest mass SMBHs that can launch relativistic jets and offer insight into the conditions necessary for jet formation. But classifying NLS1s in large samples is challenging due to low S/N ratio. We use FORS2 observations of ∼100 candidate NLS1s to classify the sources and perform detailed spectral modelling of Hβ, [OIII], and the Fe II pseudo-continuum using the Voigt profile. We found 16 Changing-look AGN and a contamination factor of ∼28% in our data. We study how the line profile of the broad Hβ line changes from Lorentzian to Keplerian motion-dominated Gaussian with the BH mass to determine if the changing line profile is an essential part of intraclass evolution. Studying NLS1s in the local universe, which resembles high-z, AGN allows us to explore BH growth in the early universe.