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can i retake a sectional test?

Can someone please post the approach to solve this question ?
Q : For how many natural numbers less than 10^5 is the sum of their digits equal to 10 ?

No

i am not able to solve dilr questions that are of lod2 in arun sharma's book

are NMAT mocks adaptive?

A mixture of 20 kg of water and spirit contains 10% water. How much water must be added to this mixture to raise the percentage of water to 25%

I'm able to solve previous year's CAT questions easily but my quants sectional scores are in the range of 15-25 in CrackU mocks. I've practiced so much but still scores aren't
ascending. What is the reason?

can I download the pdf of the mock test

6. How many four-digit perfect squares 'abcd' are possible such that 'dcba' is also a four-digit perfect square and is also a factor of 'abcd'? (given a + d)

a) 0

Ob) 1

c) 2

d) More than 2

Important questions ssc cgl tier 1