My weekend I started ion fFriday, after school.

Days of the week start with a capital letter in English. Use "on" instead of "in" when preceding a day of the week. The placement of "I" after "my weekend" wouldn't be natural. Alternatively, you could say "I started my weekend after school on Friday".

I go to home at sixteenfour o'clock.

The "to" is not necessary. In English it is more typical to say four o'clock rather than use the universal standard time.

After Iwards I will reading book, beacocause this is my hobby.

"Afterwards" or "Then" would be more likely. You need the future tense of "read" - it's irregular. I might write a completely different sentence saying "This is one of my hobbies".

I love romantice and fantasy.

"Romance" is the noun, "romantic" is the adjective.

IThen, I will eat dinner and watch a tv series with my mom and dad.

Again, you need the future tense of the verbs "eat" and "watch" here.

IOn Saturday iI have little home tasks.

English uses "on", not "in", with days of the week. "I" needs to be capitalized.

I muss't clean the kitchen, the family room, my bedroom, and the bathroom.

I would put articles (the) in front of each item here. "And" usually comes before the last item in a list of items.

After IThen I will spend time with my siblings and my grandma.

Future tense of "spend" by adding "will". You need to repeat "my" in front of "grandma" because it doesn't refer to the same person as "siblings".

IOn Sunday I muss't much learn, beacose in monday ihave to study a lot because I have a test on Monday.

Use "on" for days of the week. "Have to study a lot" is much more natural in this context than "learn much". Always capitalize "I".

My weekend I started ion fFriday, after school.

Remember to use Capitals on DAYS,

I go to home at sixteen o'clock.

After, I reading a book, beacocause this is my hobby.

Try not to make it awkward, you want to transition smoothly.

I lovMy favourite genres are romantice and fantasy.

Different book categories are called genres.

I eat dinner and watch tv seriesa TV show with my mom and dad. (or you could say "parents"

IOn Saturday i, I have little home taska couple of chores.

Hometasks = Chores

I muss'tneed to clean the kitchen, familyliving room, my bedroom, and the bathroom.

must = need - in this context

In Sunday I muss't much learn, beacose in monday i have test.

On Sunday, I need to study because on Monday I have a test.

My weekend I started iI started my weekend on friday, after school.

For days of the week we would use the preposition 'on'

I go towent home at sixteen o'clock.

Past tense of go = went

After I reading a book, beacocause this is my hobby.

Past tense of reading = read
We need an article before the noun 'book'

I love romantice and fantasy.

We use romance to describe the book genre

I eate dinner and watched a tv series with my mom and dad.

Past tense of eat = ate
Past tense of watch = watched

IOn Saturday i have little home task, I had some small household chores.

Past tense of have = had

Changed the last part to make it feel more natural. We would describe home tasks as chores typically

I muss'tneeded to clean the kitchen, the family room, my bedroom, and the bathroom.

'Needed' would be more natural here

After, I spendt time with my siblings and grandma.

Past tense of spend = spent

IOn Sunday, I muss't much learn, beacose ineeded to study for a test on mMonday i have test.

The verb 'study' would work better here

Changing the end to a structure that feels more natural

My weekend I started in friday,I started my weekend after school on Friday.

I go tot home at sixteenfour o'clock.

I don't know how it is for the brits but we Americans don't generally use the 24 hour clock outside of the military. Some even call it "military time". To make it clearer, you can say I got home at four p.m.

AfterThen I reading a book, beacocause this is my hobby.

I love romantice and fantasy.

I eat dinner and watch tv series with my mom and dad.

IOn Saturday iI have little home taska few chores.

I muss't clean the kitchen, the family room, my bedroom, and the bathroom.

After that, I spend time with my siblings and grandma.

IOn Sunday I muss't much learn, beacose in monday ihave a lot to learn, because I have a test on Monday.

See ya!

Very casual but totally fine.

My weekend I started ion fFriday, after school.

I go towent home at sixteen o'clock.

Use the past tense here. Depending on where you live, we will sometimes say 5 o'clock instead of 16 o'clock but usually just numbers are used.

After, I reading a book, beacocause this is my hobby.

I love romantic and fantasy books.

I eate dinner and watched a tv series with my mom and dad.

Use past tense if this is an action that already took place.

I On Saturday iI have little home taskchores.

I muss't clean the kitchen, family room, my bedroom, and the bathroom.

After, I spend time with my siblings and grandma.

IOn Sunday I muss't much learnt study a lot, beacocause ion mMonday iI have test.