Please correct my sentences

Question

When i was in eighth grade I had almost everything that I needed. I had my group , my favorite teachers teaching me .  And even my grade's were at its best . It was my most memorable time period of my life

Blue Jay · Accepted Answer

When I was in (the) eighth grade I had almost everything that I needed. I had my group, and my favorite teachers teaching me. And even my grades were at ~~its~~ their best. It was my the most memorable time ~~period~~ of my life.
Notes:
1) The personal pronoun I is always capitalized (I, not i).
2) There should be no space before a punctuation mark such as a comma.
3) A plural is usually formed by adding an s to the end of the word. 's (singular) or s' (plural) indicate belonging to XYZ or of XYZ.
The dogs are sleeping.
The dog's paws are muddy (The paws of the dog).
The dogs' paws are muddy (the paws of the dogs).
4) Its is singular. Their is the plural.

SucheetBoppana · Answer

thank you Mr. Blue Jay

Please correct my sentences

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