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Feeling overwhelmed when doing the CAT daily target Qs as am not able to solve many of them. Have just started the prepand am currently doing the daily batch tasks what else should i be doing

From where I should learn daily vocabulary for snap

In today's daily Target, Quant section..
question No.4 of "Sum of integral values of X", why the value 19 doesn't satisfy if we make the equation like x² - 18x -16 <= 2/5 then make it like 5x² - 90x -82 <= 0, till 18 it's fine but 19 doesn't satisfy the equation here, why is it the case here !? In the solution given there, it is solved in other way and it is satisfying, why not here by doing like this !?

problem ye h ki me language Hindi nhi kr pa Raha kese kru

There used to be a comment section under the solutions for Daily Targets. Has it been removed?

Let f(x) = a12x^12+ a10x^10 + a8x^8 +.... +a2x²+a0, where a0, a2....a12 are all real. If there are 3 sign changes in f(x) and f(x) has exactly 4 non-real roots, then which of the following is definitely true?
a0 = 0
a10 > 0
a10 < 0
a10 = 0

If I opt for Daily Targets, can I access the previous days questions if I miss on that particular day?

time and work

Are cat daily target of varc on the harder side ?

Any tip to excel in quants??