The mole concept is one of the topics with which you leave your preparation of physical chemistry in class 11. One of the reasons for it being taught earlier is that the concept of mole will be required in almost every other topic of physical chemistry that you study later, irrespective of the complexity of that topic.
Apart from its relations in chemistry, it must be noted that mole concept is one of the easier topics in chemistry, so, make sure you do study it well and go through each and every point in this topic.
The mole is the unit of measurement in the International System of Units (SI) for amount of substance. 1 Mole is just a number whose value is equal to the Avagadro’s number i.e. 6.022 X 10^23. So, when someone claims of a matter to be of One mole in quantity, that implies that the matter under consideration contains exactly 6.022 X 10^23 number of particles (atoms, molecules, ions, electrons or any other elementary entities). This is very similar to the unit ‘dozen’, which is a common analogy used to explain the concept of mole, a dozen is always equal to 12 irrespective of the object referred to.
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