  Precision observables are well known for constraining most of the Beyond
Standard Model (BSM) scenarios tightly. We present here a simple and
comprehensive fitting framework for various BSM scenarios to these observables.
We start with the fit of $S$, $T$ and $V$ parameter and their correlations
using the Electroweak Precision Observables (EWPO) including the recent $m_W$
measurement from CDF-II. Utilizing these observables, we also fit various New
Physics (NP) scenarios consisting of different subsets of dimension-6 Standard
Model Effective Field Theory (SMEFT) operators in the Warsaw basis out of a
total of 10 appearing at tree level in EWPO. To further constrain these
scenarios, we augment these observables with $\Delta_{CKM}$ measurement using
1-loop matching of the Low Energy Effective Field Theory (LEFT) to SMEFT
operators at the Z-pole. We show that the inclusion of $\Delta_{CKM}$
constraint indeed results in stronger bounds on the SMEFT Wilson Coefficients.
We also constrain the UV parameters of BSM extensions like Vectorlike leptons
(VLL) and find out that such a minimal extension is in tension with the
forward-backward asymmetry in $b$-sector ($A_b^{FB}$) and the recent
measurement of $M_W$. In order to lift the two blind directions, which one
encounters while fitting all the 10 SMEFT WCs at tree-level, we also include
the LEP-II observables pertaining to the $WW$ production and present the
results for the fits with and without $\Delta_{CKM}$ constraint.
