There are many techniques that will help you to memorize more of what you study. 

Use images

90 percent of the information that our brain processes are visual. And the human brain processes images faster than words. So, turning words or equations into images is an effective memorization technique. One general technique that can be used to improve memory is visual imagery. This is a memory technique in which we construct mental images when learning new information in order to better recall the information later. 

Use acronyms and mnemonics

An acronym is an abbreviation formed from the first letter of a series of words. For example, VIBGYOR is a popular mnemonic device used for memorizing the traditional optical spectrum. It indicates the colors 

V-Violet | I-Indigo | B-Blue | G-Green | Y-Yellow | O-Orange | R-Red

A mnemonic is a short phrase used to remember a rule or a principle. Mnemonic techniques are ways to help you memorize a phrase or idea with patterns. Mnemonic techniques can include songs, poems, rhymes, outlines, images, and acronyms. 
For example, to memorize the spelling of “separate,” you can use the phrase “there is a rat in separate.” 

Connect the information to something that you already know well

it’s easier to learn something new if you can link it to something you already understand. By forming these connections, you’ll retain more of the information you learn about the content. A specific part of the brain appears to be involved in this process: the medial prefrontal cortex. During the successful retention of related information, a different part of the brain was active than when unrelated information was memorized. The brain area we found, the medial prefrontal cortex, probably linked new information directly to prior knowledge. 

Use colors

Colors capture our attention.  They give context to the material you’re studying and help you to process it more efficiently. When you color-code information, it allows your brain to pre-process the information before you actually study it. Using highlighters, multi-colored pens and multi-colored sticky notes will help you to learn better. Use a consistent color code across all your subjects and topics. It will give uniqueness to your writing. 

Use as many of your senses as possible

Our senses play a key role in how we encode memories. The idea that sensory stimuli like touch, sight, and sound can aid in learning is the basis of the renowned Montessori Method. The more senses you engage in the learning process, the better you’ll remember the information. There will be specific smells, songs, or views that make you remember some other events.