Brief: I have requirement for website and I am trying to add much details as possible here. 

Design Preferences: wordpress theme colormag 
Static pages: Home page, Take TEST,  Contact us, About us etc
Preferred Customizations:
Custom Banners for Homepage slider needed?
Custom Illustrations/Icons?

EDIT 1 : Detailed flow of website. 

 Website flow. : 
1) Home page : 
Slider with 3 to 4 slides (Explaining about uniqueness of site) After thatShall show uniqueness/features of the website in small boxes.  Widget to show some success stories on home page and see more button for .
2) Book Test : What is this test (TEXT)? 

1. [Take test button] -> this should go to first register or login page. 
2. Once login they should be the pay button. 
3. Once they pay they should get an email that they have paid and test should be visible. 
4. Classmarker test should be embedded in website.
5. Automatic email with pdf (Interview preparation material) should be sent once they pay. 

3) About us :      I will fill up the text later.
4) Success stories :       Link to blog page of Customer success stories.  
5) FAQ :    Page with questions and answers. 
   Privacy policy and terms and condition check boxes should be    checked   before registering a user. 
6) Blog : I should be able to update the blogs myself later and update the content. 
7) Contact us page.Simple contact us page should be implemented. Mail should directly come to mail inbox.
User Dashboard : 

1. User should be able to change the password / update the password. 
2. User should be able to update their educational details. (Name / /Degree / year of completion / Mobile no)
3. User should be able to see his payment history. 
4. User should be able to see the his score (we can discuss about this if this is possible with classmarker.)

I want to keep updating contents of my website later, I am software engineer but I want an overview about everything so I will handle it later. Please send me 3,4 wp themes so that I can decide between them. Please tell me the possible timelines when can you finish it or we can go step by step. What is your policy of support later?

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Edit 1 : 
Hi Please check more clear website flow. Let me know if you are still up for this? Website flow. : 
I am looking forward for this theme. I liked this theme. If there are any other options in your mind we can discuss. https://themeforest.net/item/reptro-online-course-wordpress-theme/21817850?irgwc=1&clickid=3c1Qfw1-1...
If we are using this theme, we need to update the registration form. Guide is in below link.I want registration form equivalent to https://www.myamcat.com/ on home page.
https://docs.thememylogin.com/article/62-adding-extra-registration-fieldshttps://docs.thememylogin.c...


1) Home page : 
Slider with 3 to 4 slides (Explaining about uniqueness of site) After thatShall show uniqueness/features of the website in small boxes.  Widget to show some success stories on home page and see more button for .
2) Book Test : What is this test (TEXT)? I will fill up the text later.

1. [Take test button] -> this should go to the first register or login page. 
2. Once login there should be the pay button. (Payment gateway image is attached.)

Please tell if you can achieve this. All payment methods should be there,Paytm, netbanking, credit card, debit card, UPI.  We can discuss if checkbox is achievable or not as shown in image. 

1. Once they pay they should get an email that they have paid and test should be visible. 
2. Classmarker test should be embedded in website. We can discuss more option if you have in mind. 

The reason I am choosing classmarker because it has a functionality to Create a test mixed with multiple subject questionnaire. This feature I have not found in any other quiz plugin or even learndash.

1. Automatic email with pdf (Interview preparation material) should be sent once they pay. 

3) About us :      I will fill up the text later.
4) Success stories :      Few customer success stories should be displayed on homepage and with more button for Blog or page.  
5) FAQ :  Page with questions and answers. I will fill up the text later.   Privacy policy and terms and condition check boxes should be    checked   before registering a user. 
6) Blog : I should be able to update the blogs myself later and update the content. I will fill up the text later.
7) Contact us page.Simple contact us page should be implemented. Mail should directly come to mail inbox.
I want log in  and register button on home menu.Also I want registration page on home page.(Small right hand side.)You can refer these two similar sites. https://www.myamcat.com/  and https://www.elitmus.com/
User Dashboard : 

1. User should be able to change the password / update the password. 
2. User should be able to update their educational details. (Name / /Degree / year of completion / Mobile no)
3. User should be able to see his payment history. 
4. User should be able to see the his score (we can discuss about this if this is possible with classmarker.)

I want to keep updating the contents of my website later, I am software engineer but I want an overview about everything so I will handle it later. Please tell in detail what you can achieve and can not before starting the project itself. I do not want conflicts later. Please ask if you have more questions.Please tell me the possible timelines and budget when can you finish it.What is your policy of support later?