What is English grammar, what is parts of speech how many types of parts of speech , Maths study wb

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What is English grammar, what is parts of speech how many types of parts of speech , Maths study wb
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Simple interest.
Part.1.https://youtu.be/jLaedkCPPjQ
Part-2.https://youtu.be/mP1hZMFMmhE
Part-4.https://youtu.be/k0qb4KTvNs4
Part -5 https://youtu.be/mP1hZMFMmhE
Part-6. https://youtu.be/0IPjc11Tfvk
Compound Interest.
Part-2.https://youtu.be/I_yVRfwy2wA
Part-3.https://youtu.be/UDKUeNdHcjg
Part-4.https://youtu.be/ouufF7yCraA
Part-5.https://youtu.be/SrXd9OBv_d4
Part-6.https://youtu.be/a_-RXcjTwDA
Part-9.https://youtu.be/tEnNiG4IA4M
GK.
Days and Dates.https://youtu.be/VmToNIGmZqs
20 Top GK.https://youtu.be/IZmg90vHI34
Definition of English grammar:https://youtu.be/ARUQ5AVV5mY
Letter"A" ka Operation:https://youtu.be/Pdiy7LDbR4I